Probably yabapmatt's code or one of the libraries that it employed did not scale to HF19.5.
sleeplesswhale, proffit, bid4joy and lost-ninja suffer the same fate.
alliedforces and sneaky-ninja which seem to belong to the same owners and to use the same code as lost-ninja work fine.
sunrwhale works fine and aksdwi after a long duration of ignoring bids when other bots were fine, is now fine when other bots are off.
Lightningbolt suffers too but resumed operation in some twisted way.
Adriatik skipped a bid one me after 6 months of reliability, but resumed to work as good as usual.
All these bots seem to use yabapmatt's code with individual modifications maybe as different input parameters.

upyourpost is the new most reliable bidbot.
weupvote is very iffy and dangerous, and just skipped my bid (edited for this update) and turned to be beneficial for me despite this case.

There was also this bid that got skipped:
https://steemd.com/tx/bdf5955197194241bb5bf6b0db87b577335dcd4d
A 0.13 SBD bid.
Obviously a manual vote of 100% would make me happier than a refund in this case, but I deserved a 50% vote on it, so you can give me a 50% too.
Maybe a manual vote will restart the bot's orderly operation, or help you find a solution.
Vesting your income instead of reusing it to rent STEEM would have made you less vulnerable to these situations, when you pay for resources and then do not use them.