Problem with unity ads after publish the game in play store

The problem is when the ads in test mode , it is working fine but when i publish it
it works fine (the ad show every 4 time when the player die):
the problem is : it show me (one ad or two just) and then nothing
the ad don't show up unless i quit from the game and open it again
i really want to know why ad just show one or two then don't?
i use unity 2018.2.2.1f

 

yes it is happen in all devices
where should i send logs ?
i integrated Ads SDK using Services window which is Unity Ads 2.1.1

 

This is log

D:\Android SDK\platform-tools>adb logcat -v time UnityAds:V *:S
int logctl_get(): open '/dev/hwlog_switch' fail -1, 13. Permission denied

Note: log switch off, only log_main and log_events will have logs!
--------- beginning of main
10-22 20:16:58.908 I/UnityAds(12533): com.unity3d.ads.UnityAds.initialize() (lin
e:148) :: Initializing Unity Ads 2.1.1 (2101) with game id 2749965 in production
mode
10-22 20:16:58.922 I/UnityAds(12533): com.unity3d.ads.UnityAds.initialize() (lin
e:160) :: Unity Ads environment check OK
10-22 20:16:58.976 I/UnityAds(12533): com.unity3d.ads.configuration.InitializeTh
read$InitializeStateConfig.execute() (line:214) :: Unity Ads init: load configur
ation from https://config.unityads.unity3d.com/webview/2.1.1/release/config.json

10-22 20:16:59.280 I/UnityAds(12533): com.unity3d.ads.configuration.InitializeTh
read$InitializeStateLoadCache.execute() (line:267) :: Unity Ads init: webapp loa
ded from local cache
10-22 20:17:00.785 I/UnityAds(12533): com.unity3d.ads.api.Sdk.logInfo() (line:70
) :: Requesting configuration from https://publisher-config.unityads.unity3d.com
/games/2749965/configuration?bundleId=com.AsemGames.inJump&encrypted=true&rooted
=false&platform=android&sdkVersion=2101&osVersion=6.0&deviceModel=CAM-L21&langua
ge=ar_JO&test=false&deviceMake=HUAWEI&advertisingTrackingId=ca3ffee7-6b67-4a5c-9
ad2-11ed1c7e2efc&limitAdTracking=false&frameworkName=Unity&frameworkVersion=2018
.2.2f1&adapterName=Engine&adapterVersion=2.1.1
10-22 20:17:01.546 I/UnityAds(12533): com.unity3d.ads.api.Sdk.logInfo() (line:70
) :: Received configuration with 3 placements for token eyJhbGciOiJIUzI1NiIsInR5
cCI6IkpXVCJ9.eyJhdWMiOjIwNSwiY3BpIjoxMjMsImlhcCI6NDgsImx0diI6NzksInBybyI6MTQ4LCJ
4cHIiOjIzMCwic3ViIjoiWkc0dkdZMENNT3RHZGJRdWlzb3NVTWJ6VEpYT2p3SElvNUc4YzRvTFRNbmx
LRS9NMkRzVVZtY1dlN3FJYmFGbXB6c0w4QT09IiwiaWF0IjoxNTQwMjI4NjIzLCJleHAiOjE1NDE0Mzg
yMjMsImlzcyI6ImNvbWV0LnVuaXR5YWRzLnVuaXR5M2QuY29tIiwiY3JlYXRlZCI6MTUxNDkwODE3OTA
wMH0.vjGAYuAEc5GWzueuqi-3x4MFJcOO8ZxYIcGeefgDilg (A/B group [object Object])
10-22 20:17:01.631 I/UnityAds(12533): com.unity3d.ads.api.Sdk.logInfo() (line:70
) :: Requesting ad plan from https://auction.unityads.unity3d.com/v4/games/27499
65/requests?advertisingTrackingId=ca3ffee7-6b67-4a5c-9ad2-11ed1c7e2efc&limitAdTr
acking=false&deviceModel=CAM-L21&platform=android&sdkVersion=2101&stores=google&
deviceMake=HUAWEI&screenSize=268435858&screenDensity=320&apiLevel=23&screenWidth
=720&screenHeight=1208&connectionType=wifi&networkType=2
10-22 20:17:02.943 I/UnityAds(12533): com.unity3d.ads.api.Sdk.logInfo() (line:70
) :: AdPlan received with 2 campaigns and refreshDelay 3600
10-22 20:17:52.238 I/UnityAds(12533): com.unity3d.ads.UnityAds.show() (line:304)
:: Unity Ads opening new ad unit for placement video
10-22 20:17:52.434 I/UnityAds(12533): com.unity3d.ads.api.Sdk.logInfo() (line:70
) :: Opening mraid ad unit with orientation NONE, hardware acceleration enabled
10-22 20:17:52.799 I/UnityAds(12533): com.unity3d.ads.api.Sdk.logInfo() (line:70
) :: Unity Ads event: sending start event to https://adserver.unityads.unity3d.c
om/events/v2/brand/video/video_start/2749965/005472656d6f7220416e6472
10-22 20:17:59.332 I/UnityAds(12533): com.unity3d.ads.api.Sdk.logInfo() (line:70
) :: Requesting ad plan from https://auction.unityads.unity3d.com/v4/games/27499
65/requests?advertisingTrackingId=ca3ffee7-6b67-4a5c-9ad2-11ed1c7e2efc&limitAdTr
acking=false&deviceModel=CAM-L21&platform=android&sdkVersion=2101&stores=google&
deviceMake=HUAWEI&screenSize=268435858&screenDensity=320&apiLevel=23&screenWidth
=720&screenHeight=1208&connectionType=wifi&networkType=2
10-22 20:18:00.001 I/UnityAds(12533): com.unity3d.ads.api.Sdk.logInfo() (line:70
) :: Closing Unity Ads ad unit
10-22 20:18:01.656 I/UnityAds(12533): com.unity3d.ads.api.Sdk.logInfo() (line:70
) :: AdPlan received with 0 campaigns and refreshDelay 3600
10-22 20:18:29.122 I/UnityAds(12533): com.unity3d.ads.api.Sdk.logInfo() (line:70
) :: Requesting ad plan from https://auction.unityads.unity3d.com/v4/games/27499
65/requests?advertisingTrackingId=ca3ffee7-6b67-4a5c-9ad2-11ed1c7e2efc&limitAdTr
acking=false&auctionId=aeb76c65-659c-401c-8002-3c6952ee8212&deviceModel=CAM-L21&
platform=android&sdkVersion=2101&stores=google&deviceMake=HUAWEI&screenSize=2684
35858&screenDensity=320&apiLevel=23&screenWidth=720&screenHeight=1208&connection
Type=wifi&networkType=2
10-22 20:18:30.039 I/UnityAds(12533): com.unity3d.ads.api.Sdk.logInfo() (line:70
) :: AdPlan received with 0 campaigns and refreshDelay 3600