More frequent crashes/disconnects

Since about late last year up to present, I've been facing more frequent random client crashes and disconnects. My ping also tends to spike up more frequently, sometimes to a point where the game is unplayable (rubber-banding).

They tend to occur at the worst possible time such as right at the time a raid boss is pulled. This causes me to be thrown out of a raid and locked out for that week unless a wipe happens.

At first I thought it was my internet, but I've had no problem connecting to other websites.

I was wondering if there are any fixes I could apply to alleviate this issue.

Thanks in advance.