Access violation under Windows 10

Under Windows 10, I have setup to shutoff the monitor after 1 hour of inactivity. I normally leave my Thunderbird active overnight under PortableApps (and sometimes Firefox, too). I do not allow "sleep" to occur overnight. When I return to the monitor, I find a stack of error popup windows, each reporting the same following error: Access violation at address 0052CD6C 'PortableAppsPlatform.exe' read of address 00000004.

It appears as if this error is regenerated about once every 30 minutes after the screen shuts off. Is this a known problem? Any suggestions for a fix?