Analogue-sequencer

hi Colin,
got some minor weirdness going on..i'm not quite sure if it's new to 
OSv3.8 or if it's been there all along, but it's getting noticeable 
now that my fingers are developing button-shaped indents..;)
when in play mode (of course..) i go to playlist-edit, push 
the 'hold' softkey to hold a certain step in the playlist and then go 
to pattern-edit mode to edit the pattern for that step, the playlist 
releases the 'hold' function as soon as i change the timebase for the 
pattern, so the playlist continues advancing. it does the same when 
stopping & restarting the p3. the stop/start thing i can understand, 
but the first one shouldn't be happening should it? neither of the 
cases are a major issue but it can be frustrating having to save a 
half-finished pattern with the risk of forgetting what you were going 
to do (keep in mind i'm in Holland and you know one of the things 
we're known for..:) ).
and i had another thing but this only happened once and was fixed by 
re-uploading the firmware; i was happily tweaking away when i think i 
hit a bad combination of keys or i just hit them too quickly, and the 
top line of the lcd went black and the bottom line went blank. i've 
had this happen before (i think it's got something to do with keys 
being hit too fast after each other?), so i do what i usually do: 
reboot and go on. but this time i got a 'bad checksum' error on 
rebooting, leading to the boot/flash screen. i hit boot and the p3 
starts up as normal, except that the playlist-edit has a weird bug 
where it seems to select random playlist steps instead of the one i'm 
tweaking when i turn the repeat or transpose pots above the step. so 
i made a sysex-dump of all patterns (no problems) and then re-
uploaded both the firmware and the patterns, after which it was fixed.
also not a major thing, but do you have any tips on how to avoid it 
in the future? i'm guessing it's the cpu getting confused when keys 
are hit too quickly after each other...which would mean i just need 
to chill out a bit. :)
grtz Chiel