RE: Gears Icon in GP 2018
I'd still go with seeing if you get this issue on more than one install of Dynamics GP as well as more than one machine.
Remove any third-party products, Citrix, customizations to verify whether any of those are causing the issues to occur.
If the issue is completely random in occurrence, you could be potentially running into a connectivity/network issue with Dynamics GP and SQL Server. As a test, if you install Dynamics GP directly on the SQL server, do you get the same issue?
If the users all use only one instance of Dynamics GP, you can try re-naming the GP directory when all users are logged out, then run a Repair against it via Control Panel > Programs > Programs and Features, which will completely re-create the entire GP directory, minus third-parties, customizations.
You can then have users login to this 'new' GP instance and see if this issue still occurs. If not, add back any third-parties, customizations and such one by one, testing after each one, until the issue returns.
--if it returns, you most likely have the cause.
--if it doesn't return, then it could've been an issue with the GP directory/files themselves.
Thanks