Have you tried erasing eeprom?? connect to MP through USB and in terminal go to setup/ erase. repeat a couple of times and upload the firmware again.
i'm having the same problem. so whatever solution i find i'll let you know. remind me if i don't reply soon please.
also, if you find a solution, please let me know!!
wow yours is really crazy...
mine stays on -4 steady sometimes when i land. it's weird. but the big problem with mine was that it would twitch midflight. i solved it by soldering everything: motor bullets and ESC connectors to the PDB. it got solved!!
the bullets felt hard solid before soldering them. right after i soldered them it started flying perfectly.
I even checked the log of a stable flight and the VSI goes all around, but it seems to not affect the flight.. it's gotta be dampened somehow.
if your flight is bad, solder everything. highly recommended!
I'm seeing the same problem on my new APM2 with MP 1.1.55 and V2.5 firmware...would love to know if this is normal also.
hm.. do you know if it is the same sensor? either it's too sensitive or bad, or the graphic needle is not dampened (for visual relief i mean).
Me and friend of mine having the same problems - discussion here =(