Finally confirmed it's not just with Neopergoss, but also with pizzaharald, too. Also confirmed it's not specifically Septima. Happened with alt- Prima Rhay, too. Issue persists, comes typically after 30minutes or more of play. Functioning returns similarly 30 minutes or longer.
On the plus side, haven't had any pvp stuck screens during opening/mulligan in a long time. Seems that issue is gone.