Before to flash beta was installed stable, same issue. I have been use hard reset as per your instructions after flashing from stock to Merlin.After flashing the latest beta (386.3 Beta 3, correct?), did you do a full reset to factory defaults without using any saved backup config files?
Yes, but not with this router, it was xiaomi 3g with padavan fw, wo any issue maximum speed with some reducing due to losses.Have you ever hit the max you expect on OpenVPN
I use all dafault option, disabled QOS, installed skynet and diversion only.What options past defaults are you using in the OpenVPN settings?