Thank you for all the suggestions, I’ve changed the config as suggested, unfortunately the problem still happens.

There seems to be little for me to investigate.
The latest crashes all occurred when there was very little load on the server and on firebird.

All access is done by php which I’m inclined to think might be the culprit, but there doesn’t seem to be any recognizable pattern on the errors.
The windows event logs aren’t showing anything but the crash themselves.

I’m open to any suggestion on how I might track this problem.

My current config (changed dbpages, tempdir, removed dummypacketinterval):

ServerMode = Super

TempDirectories = C:\(my temp dir)

DefaultDbCachePages = 20000

TempBlockSize = 2M

TempCacheLimit = 364M

AuthServer = Legacy_Auth, Srp, Win_Sspi

AuthClient = Legacy_Auth, Srp, Win_Sspi

UserManager = Legacy_UserManager, Srp

TracePlugin = fbtrace2db

WireCrypt = Disabled

RemoteServicePort = 3050

LockMemSize = 9M

LockHashSlots = 30011

GuardianOption = 1

Latest crashes, with very little load/usage

Tue Aug 22 16:45:12 2017 terminated abnormally (4294967295)

Tue Aug 22 17:38:40 2017  terminated abnormally (4294967295)

Tue Aug 22 17:46:18 2017  terminated abnormally (4294967295)

Tue Aug 22 17:54:45 2017  terminated abnormally (4294967295)

Tue Aug 22 18:58:56 2017  terminated abnormally (4294967295)