The 315 MHz transmitter that I have use to control some rf outlets for the last year failed today. It failed in the always transmitting mode! This caused my garage door remotes to have only about 10 feet of apparent range.
So if you suddenly loose range on your garage door remotes, power off any 315 MHz transmitters you have.
The transmitter i was using was a WL102-341 from aliexpress and has worked flawlessly for the last year.