Forerunner 255S crashes since 21.22

Hello,

My watch crashed 1 month ago for the first time because (i guess) of the known bug lf 21.22.

I struggled to make it work again because Master reset didn't complete but it finally did. 

Today i'm up to date on my watch but it still crashing randomly. I tried to connect to phone, connect to Garmin express, not to, delete GPE.BIN, not to delete it, connect IQ, not to, factory reset, restore save, etc. I finally recorded an activity yesterday, but it crashed after synching and now i can't even make triangle appear, neither reset.

Could you help me? Is it possible to find logs to help ?

Thanks Pray