Strange problems with wired headphones

Greetings.

I have been having some strange problems with several pairs of wired headphones I’ve been using with my iPhone 8 lately.

I’ll plug them in for the first time and, then, about a month later, one of the speakers goes out or mostly goes out. What I mean is that, when I move the jack around in the adapter, the audio sometimes comes back but goes away again if I move the jack around even slightly. When this happens, I try them with several jack to lightning adapters with the same result. When I put those headphones into another device like my PC, they work just fine. Indeed, I have sadly thrown away a few pairs of headphones because of this thinking that the issue was with them, but it also happened recently with some newly-purchased headphones from Amazon.

I tried contacting Apple, but, as you might expect, they said they couldn’t help because the headphones were third-party.

Any idea what could be causing this and how I could fix it?

If there are no ideas, I may just have to go ahead and purchase some bluetooth headphones.

So, any recommendations? Here’s basically what I would be looking for, in order of priority.

1. They MUST be on-ear (NOT in-ear or over-ear)!

2. They must have a good microphone/good recording quality.

3. They must have long battery life. I spend practically all day with headphones on my ears with my iPhone.

4. They should have clear sound quality and a wide volume range. I have a mild hearing loss as well, so I need to concentrate more on this.

I was looking and saw some Beats on-ear headphones on Amazon with apparently 40-hour battery life. I’m wondering if anyone has had experience with these? As I understand it, Beats is in some way affiliated with Apple, so they would probably work more seamlessly with an iPhone.

Thanks.