Almost every time I turn on my 536, it gives me the "Clock Settings Lost" error message on start-up. I have to set the clock every time. For a while, it would give me that message and when it went into the clock set mode, it would show the correct date and time. Now, it resets to default and I have to set the time and date. What's going on here? I use the scanner for at least eight hours every day and this issue has only started happening in the last week or so. I have also began noticing that my 436HP is doing the same thing when on battery power.