Strange keyboard issues. recommendations?

[PJemus]

having some weird issues with my keyboard. sometimes specific keys work and sometimes they don't. at one point my shift button seemed to work 4 to 7 times in a row, and then it would not work 4 to 7 times in a row. My function key is not working at all, which is very frustrating. my 8 and 9 keys work perfectly fine sometimes, but then they don't work at all later. very confusing. My laptop is Acer Aspire S. any idea where to even start with this one?

[Action_Johnson]

Can you remove the top deck fairly easily? If canned air doesn't work to dislodge some stuff, I'd say send it to Acer and quit eating over your computer.