Install is over asbestos shingles and is just a few months since it was put up.

If the nails were put in too tight to allow the panels to float with temptature changes since it expands and contracts, it will do that. Or if they were cut too long and they butt up against the corner trims preventing them from floating or allowing them to expand it will do that.

You should contact the company that you paid to install them.

If you are in a northern climate, this winter has caused vinyl issues. The siding shrinks with the cold and the nails stop the shrink and the siding bows. OR, as Smoothy says, the nails are too tight. You should be able to slide vinyl siding back and forth a bit.

Try to slide the panels back and forth. If they don't move they were nailed too tight or cut too long like Smoothy said. My vinyl siding has been up 22 years and still slides back and forth and has never bowed.Did they install foam board underneath the siding?