There are a number of possible causes for this on an ME Super, it can be a faulty shutter assembly, dirty shutter magnets, a faulty mirror buffer and a few other causes as well. Unfortunately there are no certainties when trying to remotely diagnose a fault on an approximately thirty year old camera.
It can be fixed but usually is a professional job due to the extensive strip-down required, but a professional repair will cost far more than your SLR is worth. If you wish to tackle the job yourself, then click here for details. It's not a easy job, and so you might fail, but you now have nothing to lose and plenty of useful experience to gain. If all else fails then you can usually pick up another old K-mount camera for free on your local FreeCycle/Freegle groups or for peanuts on auction websites.
Good luck and please take a moment to rate my answer.
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