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The last few versions of Maya have introduced a lot of new things that break older rigs. The main one is parallel execution - it sends rig execution to multiple processors. Unfortunately that can cause crashes on some hardware and software configurations, but it's very hard to debug/reproduce.
You can try installing Maya 2018 Update 4.
(Update 4 is available on the Updates tab on autodesk's site)
And/Or, assuming Parallel execution mode is on, try turning on or off GPU Override:
Settings/Preferences>Settings>Animation>Evaluation>GPU Override
Next try: Viewport, Renderer>Viewport 2.0 Options, Turn off Consolidate World.
If that doesn't help, change Settings/Preferences>Settings>Animation>Evaluation Mode to DG instead of Parallel.
This really helped, thanks =)