美国采购需求：电子、机械泳池计时器、泳池计时器

I'm experiencing some issues with my pool timer switch. It's supposed to stay in the auto position, but it keeps slipping to the off position, especially overnight when it's supposed to turn off automatically. I've managed to get it to stay in the right spot occasionally, but it's not reliable. Could you suggest some troubleshooting steps I can take to resolve this problem? I'd appreciate any guidance on how to check or fix the timer switch to ensure it functions properly for my pool pump. Thank you!