Sick of computers..enough allready

[Esnoyer]

My V70 computer seams to have a mind of its own ,the message panel will flash messages from time to time,now while driving the seatbelt light comes on with a ding ,as it dings all of instuments quit for a moment, the light goes out shortly after, the dealer computor finds nothing. I had an 2000 S80 that warned of the following,I sold it not to long after,mirrors, windows, roof,check engine,(light bulbs ?)and every thing else you can think off, the dealer kept cancelling the lights as nothing showed as a problem.. re seat belt light, any ideas?