Why do my garage door opener remotes need to be reset frequently?
What is the condition of the batteries in the remotes? Make sure that you have good fresh batteries so that a strong signal gets to the garage door opener base unit. 

Also evaluate if it is possible that something has changed in the area around the garage door main unit. Have you recently placed some large metal object nearby that may affect the RF signal path from the remote to the base unit. Maybe an alumimum extension ladder or a metal storage cabinet. 

Lastly is it possible that a neighbor may have a similar model opener to yours and it uses a "rolling code" security feature. Your opener could be picking up some stray signals from their opener and making yours get out of sync with your transmitter dongles.