Busses that never come?

I regularly ride the 27 and the amount of times it just straight up never comes is frustrating. Is this a widespread Muni bus problem or a 27 problem? Often I’m on the transit app watching ETA and I’ll even show up 5 minutes early to make sure that I don’t get left behind. Then the app will say the bus came and left but it didn’t. I’ve tried to make this comment in the feedback but no one has ever followed up with me and nothing has changed. And no, it didn’t pass me by. Once I was sitting at the bus stop with several people after work and we were all confused.