Nextdns servers (hardware)
Nextdns servers are good, but the engineer work on the hardware is doubtfull, as the fibre patch code is not installed properly or the patch cord is the issue. In my knowledge if the patch cord is too bend then the power loss or db loss is there. There must be some inspection on that.
@Nextdns team pl look into this problem as there is a sudden increase of ping, (from initial to final 20-85% increase) then ping gets lower. Above it is explained.