I recently started having an odd problem with my kitchen faucet. When I turn the faucet on, either hot or cold, the flow is very slow intially, then it sort of ramps up to normal flow. This is the only faucet in the house that does this. It's only about 1-1/2 years old (out of warranty, not that I know it's even defective). Great pressure everywhere, including this faucet once it gets running. Copper lines, so I don't expect build-up in the pipes, and again it's not limited to the hot or cold line.
I removed and inspected the ceramic cartridge, but didn't see anything odd. Same with the aerator.
Is it possible to have some sort of vacuum/air-lock build up in the line somewhere. Doesn't seem likely to me, but then I don't have a huge amount of plumbing experience.
Thanks in advance for any ideas on how to proceed troubleshooting/fixing this.