Of late, I ride so much- distance ridden to of less importance. I just ride a lot, so if I choose i'd maybe like to just estimate my mileage. Still, I keep my computers running.
But. Two times now, the computer seems to track my speed and average speed. But it does not register my total time ridden. Have not taken the computer back. I am no where near where I bought the computer.
I would seem it would loose all it's functions and not just some. Maybe it's just the LCD display. But it gives me a display for some of it's functions. If it lost part of its display, you'd think it would be all or nothing.

Could be a flat battery.

It is a pretty new computer. Was that way soon after I bought it. Guess, the battery might be flat , even tho the computer was new. Give that a try. thanks.