Good afternoon. The issue is usually the outdoor button since it is out in the elements. You can try a replacement button and see if that fixes the issue, I have included a link for the button below. As long as your current system was manufactured after 2001, the button will sync up with your receiver. You can find the manufactured by date located on a round QC sticker on the back of your receiver. There will be several numbers printed on the sticker, the last two would be the manufactured by date. Thank you,
Customer Support Team
1800Doorbell
https://www.1800doorbell.com/rc3301-wireless-doorbell-push-button.htm
Answered for Chenelle T.