Random problem with IOS and WebGL

Hello

I am having a weird problem with my WebGl simulation in Unity

I have made a virtual tour of a pavillion in Unity, and i wanted to target
both IOS Android and Desktop, so i used WebGL. I know that is not
offially supporte on Mobile but it was working fine.

On Android and Desktop is working fine, with no problem. But on IOS
the app have a weird behavior , sometimes it works fine but other time
the app doesn't start at all. This started after i bought the Pro
license and removed the splash screen. Enabling the spash screen again does
not fix the problem.

I can't pin point the exact reason for this behaviour, i have attached a screen shot
from the Iphone, and the console log.

I see no error, only warnings.
Has anyone experienced this type of problems ?
Can it be a memory or cache problem ?

Thanks

Unity version : 2020.3.19f1
Iphone 6 , ios 14.4, also on
Iphone 7, ios 15