Coming off a Netgear modem/router straight to a TP Link splitter....no issue.
Same Netgear to a Linksys router (am able to connect hardwire direct to Linksys, computer, etc)...Linksys hardwire to the TP Link splitter, issue.
I figure the chance of getting a fix here is better than talking to a lady in China. Nothing better than bringing in a language barrier when trying to solve a problem.
1st world problems of peace.