Actually, yes, I had the same problem. I have a 6' Fortec. To fix it I peaked it on 3740V, and ION came in bad, but I never really cared, because I just wanted DW-TV and Deutsche Welle Radio. I did get a Maxpeak SAM DVB-S meter and repeaked it, but I peaked only the vertical transponders, so 3740V would come in strong. Why we both have these same issues, I have no idea. Lyngsat doesn't slow any adjacent satellites with the same transponders, so I don't know. Sounds like it could be issues with adjacent satellites though. I also try to get Comcast Network on 3940V with my commercial DCII IRD, but I have signal issues where if DW-TV comes in good, Comcast Network pixelates a visa versa. Weird, but the only thing I can think of for the cause of these problems is adjacent satellites.
Jonathan