T8sg v1 lost some model data when remove battery

Sometimes when I disconnect battery for charge, I lost some model data.

One time I lost all model data, but when I connect via USB and checked models folder I saw that missed models have strange names ]model8 and ~model7. I cant remove or rename it so I copied and renamed and moved to jumper and it worked fine, but right now I have some problems with losting some model data as I mentioned before.