Last fall (around mid-October), I installed two LED tube lights in a fluorescent fixture--since there were three lights total, it had two LEDs and one fluorescent bulb. A few days ago, I started running into an issue where all three lights in the fixture (not just the LEDs) would suddenly turn off and not turn back on for several hours. I've tried switching around the bulbs and tried running it with just the two LEDs, but with no luck. When I have just the one fluorescent tube in the fixture, though, it works fine.
LED tubes are Philips UniversalFit; fluorescent tube is 32W/48 T8, and the fixture says "use only T8 32W MAX lamps." Ballast is Class P electronic. Based on a cursory Google search it appears that the LED bulbs may be causing the ballast to overheat and disconnect--but if this is the case, I'm not sure why it would take several months to appear.
I live in an apartment, going ballast-free isn't really an option; I'm limited to plug-and-play LEDs. Any suggestions or insights as to what may be going on would be most welcome!