Yes you can get serious vibrations if your inlet is blocked
Yes it is quite common - seawater is not clean (seaweed, fish, plastic bags, ropes all get sucked in and block strainers.
Can you isolate and clean the strainers?
Or back flush?
Very very little information given here so only a short answer is possible
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.