It sounds as if your amp does not engage you musically. That may be the fault of the amp or maybe you've just gotten overly familiar with it. Most people here buy their "final" amp or other piece of gear at least a few times. After a while that amp that blew your socks off at first just doesn't do it anymore.
Find another amp that gets you involved in the music and don't worry about it being flavored or neutral, just enjoy it.
Find another amp that gets you involved in the music and don't worry about it being flavored or neutral, just enjoy it.