Why have all my LED bulbs stopped working at once?
I had a problem where I bought a house with a dimmer on the chandelier. We never used the dimmer portion, but it was one of the old style dimmers and you had to push the dimmer knob in to turn it on. One night, my daughter bumped the knob while turning it on and a LED bulb blew out. It wasn't an expensive bulb thankfully (Black Friday sale), but it still scared her. I replaced it with a standard switch and it's worked fine ever since.

It sounds like you have the non-dimmable LEDs like I do (they're cheaper). Any variance in the voltage could cause this problem (it's how the old-school dimmers did it). Make sure you don't have any stray voltage in your house. This could be a precursor to a wiring problem. As others have mentioned, get a voltmeter or an electrician out to make sure it's not wiring related.