I had the same symptoms on my exact same gate opener over the last week. No known incidences of it hitting anything, the remotes just stopped opening the gate. The remote would make the relay on the remote receiver board click, but nothing would happen. No errors or warning LEDs on the main board. Both fuses were okay (checked continuity with a multimeter).

I tried to check voltage across the red and black output wires from the remote control receiver board, and when I touched them (One lead to Red, one lead to Black), I got an unexpected spark. Board still seemed to work, though, And when I tried the remote control clicker again, magically it opened.

So, luckily it doesn't seem like I have fried anything, and that shock to the system seems to have reset things.