Well, here with my X5000/20 I have also some trouble with my Mac keyboard, getting regularly something like that:
"lllllllllllllllllllllllllllllllllllllllllllllllllllll"
As if the key is stuck.
Only solution is to unplug and then plug it again.
AmigaOne X5000 @ 2GHz / 4GB RAM / Radeon X1650 / AmigaOS 4.1 Final Edition / MorphOS 3.17
Amiga1200 / Blizzard 1230 IV PiStorm32-lite / 128 MB RAM / AmigaOS 3.9