How to deal with code 3/illegal action error?

Basically, after a new major update got released, I keep on getting code 3 errors frequently now (5-10 errors per hour)
Only happens when capturing HQ on 2-3 and 2-1 though, while no errors on doing other stuff though (Producing t-dolls, equipment, etc) Also, I was told its only happening because of clicking too fast but no. I don't even click fast. Playing on JP server btw.