As far as server issues, they tend to be random at times. I have had days where I didn't have any server issues and days where I just gave up trying to play because I had too many. For me I mostly notice them on Monday which is the day they usually start a patch of some sort.
Well tuesday at 2am which is still monday for some people I guess. During that day is when I see the most server issues. There are some suggestions on the official website depending on your system as to what you can do about them but Ihaven't tried any of them.
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