Auto weapons not working

Hey all. I tried this topic in a different forum and didn’t find a successful answer, so trying this forum instead:

Ever since I purchased Halo 5, I have had issues with ALL auto weapons. They will not shoot enemies. They work fine until I get into combat, and they do not work. This is for online and offline. I’ve tried the following solutions to no avail:

-Uninstalled and reinstalled
-Checked internet connection (someone said it could be a lag issue; it’s not)
-checked to make sure controller wasn’t broken

It appears to be a glitch… I also have the same issue with the master chief collection. I cannot find any duplicate issue anywhere online and I cannot find a contact email for 343, so I’m looking for help from you guys. Thanks!