HPU v3.15.1 save fail

Wondering if anyone else is having this issue... Shows running on a HPU (v3.15.1) after a couple days will stop being able to save show backups to USB drives or internal drive. I can save a backup using another console attached to the HogNet network with its server running. And if I try and restart the HPU it usually black screens to the Hog4 login/password prompt. This forces a full reinstall to get it to work again. Rinse and repeat after two or three days. Everything else about the HPU seems to operate fine.

Bryan