I don't think it's anything like GAS, as I've got a few basses that I can switch over to. It's just weird to me that my likes in sound changes for no apparent reason.
One day I'll play the bass and am floored by how hood it sounds. The next day I'll play the bass and am very underwhelmed and will switch to a different bass.
Like I mentioned, I used to do this with speakers. I guess that's why I used to have several pairs that I could switch out every now and then.
With a bass; however, it's so much easier than swapping speakers in and out.
For whatever reason, I tend to get tired of the same sound after a while and it starts sounding not so pleasant. I guess it's a need for change or something.
Luckily, like I've said, I can swap the bass out for another one for a while.
It's all good...just a bit weird.
"The best bass I've ever played...pure butter!"