UPD: I've removed any custom preset from device library and it works for me. No any restarts observed for two days at least. I'll put my custom presets from cloud one-by-one to get my sound back but avoid broken preset uploaded.
What's a useful thread!
I'm really looking forward to your report here, миÑтер ВоÑток, as I have same problem at the moment. 'll try to delete any custom preset for a while. as advised above. Just in case.