Big ring/shifting issues.
Hello all. Sometime ago I replaced my cassette and chain (same cassette size and chain properly measured to length), on my bicycle and ever since it has had irregular shifting issues, on and off. It went away for a bit after replacing jockey wheels, but I decided to do a chain cleaning a week ago and removed it, and reapplied with chain L, and re-installed the chain and the issue is back. I'm running a 3x9 setup (sram x-7 rear, sram x-gen front), and basically this is the problem. I generally commute in my 2nd chainring in the front, and 5-7 in the rear, or 3rd chainring and 5-6 in the rear and whenever I shift into by 3rd front ring, the rear derailleur cage catches something I suppose and the cage jumps forward and falls back down every few revolutions. Sometimes it gets pulled forward, up to the chainstay, gets stuck, and makes a terrible noise while hampering pedaling, until I coast, then it drops back into the proper position. It will do this unless if I'm in the 2nd chainring, and shift all the way up to 9 in the back, and back to 5, then into my 3rd chainring, then it doesnt do this jamming anymore. It also never does this when I shift the chain while not riding the bike (upside down or in a stand), only when I'm riding it. Can anyone help and tell me that is wrong? Thanks