Yep. I do have alot of mods. I try removing several mods I don't really like, but I still have tons of mods. I don't think the mods are causing the game crashes. I've been playing with tons of mods for months without any problem. The game crashes just start happening out of nowhere recently. I asked someone who is a really good coder and he knows a bunch about minecraft. He gave me suggestions such as installing Javfix and running it on my desktop to support Java, updating Java, or or updating my graphic card driver. I tried all of that but the game crashes are still occuring. He also told me that the mods aren't likely the problem. And yes, 1.16.4 mods are compatible with 1.16.5, for most of them I believe. I did download a mod that was recently released, but since the crashes started, I removed it. Sadly, even after removing that mod, the crashes still persist.