If OBJ is hurt, with a hernia no less, I think it explains a great many things.
This is a very competitive league, even a 20% decrease in effectiveness will drop an All-Pro WR to the ranks of average WR.
And, it is always very tough to deal with injuries in a profession that demands physicality.
Coupled with the Browns being the NFL's most disappointing team, yeah, he is unhappy, but I don't think everyone needs to jump to the conclusion that he wants out now.
A lot of things can happen before now and next season. He heals up, works with Baker to develop a better connection (not quite a Love and Harris one, but something), the Browns improve over the off-season, maybe get a new coach, and next year they roll. He'll be happy when he's healthy and winning.