Update and recap. Seems everything has been working 100% reliably for a long time now.
General recommendations > if ever (hopefully not) getting some 403, denied, erronous ban or other connection problem which does not go away after a few retries:
Try again from another device not on the network \ wifi (ip address)) that resulted in a problem, and it'll surely work (f.ex use the phone's mobile internet instead of the pc wifi), then post here with some info about time, error message etc, and things will get fixed.
Also, if not able to login due to forgotten password + email address not receiving pw reminder, or whatever problem hindering logins, use the 'Contact' button on top menu.
Thanks