I wouldn't ignore the problem, that's for sure. I would take it to your mechanic as soon as possible, and let him diagnose the situation. I'm sure it will be fine to drive to the shop, as you haven't mentioned any check engine lights.
It could be a number of things, but based on what you described, the aforementioned is most likely the culprit. The only way to KNOW, is to have it looked at.
It may be expensive to fix, but ignoring the problem will ultimately be much more costly.
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