Do you ever get stuck on a piece and can't force yourself to finish it

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I've had a commission for over a month that I can only manage to force myself to do 5 brush strokes on it per day. By now I'm so disinterested in it that the quality of some areas is noticeably poorer than my normal work. I can't wait to be done with it. I just need to finish a hand but idk if it'll happen today. The guy is kinda sketchy and I'm not entirely sure he'll pay me the second half or run with it, but i don't care that much at this point. I just wanna be free to do other things. Does this happen to you or am I just a lazy fuck?