My casio pro trek 2894 is frozen it shows op en ontop and when i press the setting button it resets time to 12h00

Hi

Have you checked that all buttons when pressed come in and out easily?
Sometimes the little spindles that press the contacts inside the watch do not come out completely and remain "pressed" even if the button appears to be "out"
Clean the watch, with particular attention to the buttons area so they can move easily in and out. If this does not do the trick, open the watch with great care not to damage the threads on the plastic case and visiually inspect if the buttons travel easily in and out and that all springs if fitted are sound. Remove and replace the batteries with new ones (DO NOT use bargain batteries from that "auction site")
and reset the watch.Try again, if ok carefully clean the back seal apply a little vaseline to the top of the seal and close the case. DO NOT over tighten the screws as this will damage the plastic thread and the watch will not seal properly and will be likely to flood with moisture. Good luck