Check your proofs in the settings try removing some old and/or spent tokens then retry

It happens from time to time. Try to use coin control more that'll help a lot  

 Thank you that worked ✊🏿 

 Dayum, very bad UX. I suspect that most of your coins were "reserved" for ongoing payments, could that be? 

 I'd suspect so  

 Yea they were. It has been resolved