I’ve 3 assets which stop depreciating since July 2019. Anyone has encountered this problem before ?

Double check if it has the Depreciation Active field as True. Check it's Depreciation History if the forecast depreciation is still there(if not might need to run Precompute Depreciation Values in the FA system setup.). Try to see if there's anything that makes these 3 assets similar and different to the rest to better filter the issue.

Cheers m8 the problem was due to a change in original amount. The steps that I’ve done to fix it is to put these 3 assets on Depreciation active : false then reset from the set-up page then rerun the precompute..

Glad it's fixed. The FA module is weird like that it can get frustrating. I only recently found out about that precompute button too\