You know the week before all the issues started happening w/ NFPS, username/pswd, & papiao.is when I ran PVRstalkerNFPS on KOD 16RC2 and I was having all my English channels buffering and freezing.
I had another device running KODI 15.2 but just running the PVRStalker (built-in) and I didn't have any buffering or freezing on English channels.
I think it's all tied in together no matter what device you were using although I don't know if the MAG's are doing this or not?