Losing data from AnimClips and geting Invalid Animator Controllers

Hey guys!
I really need help!
I have been animating 2D characters for weeks now and we have a sh*t ton of em like (30+).
The problem is once in every couple of days I come back to the office, start up unity and see that a few characters would send me this error
"
The Animator Controller (bandit2_idleanim) you have used is not valid. Animations will not play
UnityEngine.GUIUtility:processEvent(Int32, IntPtr)

"
upon checking the prefabs I see how these few characters lost their animation clips and opening the anim clips reveals that all the data (keyframes, events, curves) are gone. its an empty clip and the prefab has no animation clips . (controller is empty too)

This happens (as far as I know) completely randomly. The night before all 30 characters work perfectly fine, come back next morning and a few of em gets screwed up like this.

Im using 2019.2.3

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Same problem here. I’m on 2019.4.5f1.And this error wont cause in 2019.1.10f1.

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