If I may interject,
Having been in a few bands as a guitarist I think you problem is that you're just jamming (if the video name is correct) not playing a song.
While jamming, often the guitarist feels the need to make things more interesting with a solo or whatnot. It's not much fun playing the same riff over and over again if there arn't any vocals or other elements taking center stage.
If you want to stop endless solos try and sway the band into playing more structured songs. Or working on parts of your own songs which may not neccacarily be the guitar solo part
Often you'll find a guitarist will go into endless solo mode just because they're bored and would be more than happy to work on something other than listless jamming if asked.