Did you try to change a mudfish node based on FAQ - Nodes section for your game item? If you're using the advanced mode, please start with the basic mode.

Yes I've tried different nodes. I also tried all the ones in the 'routing path'. I've used mudfish for 2 yrs and only recently have this problem.

Umm... If you're familiar with WinMTR, please check How to use WinMTR section and test to 124.150.157.161 IP.  I think it'll show more details where this issue is from.