Unexplained crashes are hard to diagnose and even harder when we have only a description of the problem.
That said, the most likely causes include a problem in the installation of Office/Access. I note that you have the same problem in all accdbs and on two computers, suggesting an application level problem.
So, your first trouble-shooting step would be to repair the Office installation, then escalate to a full repair if that doesn't correct the problem.
Sometimes, even a simple reboot of a computer can clear up transient problems. I know it's almost a cliche, but it is always a good first step, as well.
If that doesn't get you back on track, please problem more info on the specific version of Microsoft Office 365 you have installed.