Hunting rpm

[736cc_imp]

Interesting. Sometimes restarting a computer solves a problem but other times a "cold boot" is necessary. Have you tried disconnecting the battery for 15 minutes or so then reconnecting? Disconnecting the battery should clear any corrupted code or fragmented memory from the ECM computer(s) and force a reload of a "clean OS" from permanent storage.

If this "cold boot" doesn't work, then the weak battery theory is probably a good one.

Update:
My bike was idling at 2200 rpm in gear and 1600 in neutral after trying to start w/ a very weak battery (it sat for 3 weeks or so and battery over 3 years old). Idling did slightly improve when fully warmed up but still funky.
So, I disconnected battery, squeezed brake lever (to discharge any remaining juice in capacitors), charged the same battery, drained the air box vapor collector (somebody here said to do so can help this idle issue; its the short, plugged 90 degree tube in front of air box; it was full of brown liquid that dribbled out), connected battery, turned on ignition, did the throttle roll-on procedure w/ key on before starting, turned key off, turned key on, then started the bike.
Runs as normal, 1400 rpm cold idle (it always did that), go for a ride and it idled at 1050 rpm when warmed up in a couple minutes or a mile or 2. Things seem to be back to normal for several rides now.
Try these home remedies if your bike is idling erratic and post results. Maybe this is the re-boot procedure for a confused ECU w/ a weak battery issue and air box condensation issue.