Try changing your password to use LOWER CASE LETTERS instead of numbers. This will solve your first issue.
Sounds like your changing something with all those key presses as SureType is the default usually. That sometimes happens to me if I carry the Pearl in a pocket without a case.
Change your password like above, pull the battery to reset it and/or make sure its ST mode, dont carry it in a pocket without a case and see if it still happens.