Let's not deviate from the subject.
I won't give up on (trying to solve) the problem.
It is not even a thing.
Try not to be partisan.
exclude the problem from consideration
Be careful not to trip.
You cannot solve this problem in an ordinary way.
I don't want to get mixed up in this affair.
It's best not to get involved in this problem.
There have been no problems so far.
There's no need to correct this problem.
It is thought that it has no connection to this problem.
This matter must not be trifled with.