For the record, I haven't touched the bike - just doing initial research.

I was riding today and the front derailleur started acting funny. It wasn't shifting smoothly at all, and at one point, I couldn't get it to shift at all. It did shift a little later (after which I didn't touch it again).

I've got a SRAM Apex Compact double.

Is it a simple adjustment? And is that something I can/should do myself?