During Acronis backup 12.5 on PC Windows 10 x64 Pro version1709 the USB Adata HD710 1TB gets disconnected and disappears from Windows Explorer. It started out of nowhere and only for image backups but now it does it even for file level backup - it does it at random stages. USB backup disks are formatted with NTFS as the files can get quite big. We have the latest bios and drivers. We have the latest Acronis backup software. I tried the same on another Windows 10 laptop and it did the same but it was different laptop and different Adata disk with different cable but same model usb. I contacted Acronis support but they keep blaming my machine but it worked for so long. At the moment no antivirus (but Windows Defender is running) and minimal startup items although we have necessary software running. Backup runs at night starting at 11pm when there is nobody onsite. Tasks in task scheduler are disabled.
Do you have any ideas what could be checked why suddenly the usb backup disk disappears from Windows Explorer?