[QUOTE I have given up on my cyclocomputer, every morning it reads all over the place and says my commute is many more miles than it really is and my average speed is well over 20mph where I am usually averaging around 16. Strange thing is though is that it reads pretty accurate on the way home, I don't understand. Oh well, I know exactly how far my morning commute is so I just need the time, which it can keep accurately. [/QUOTE]

Do you store your bike inside in the A/C? If yes, it could be that the bike is cold enough that you have moisture condensing inside the computer (and everywhere else for that matter)...just a thought.