You can try to move to lower RFX version.

You might also want to try running some diagnostics on the extender using the information in this post.

[Link: remotecentral.com]

However, since you don't want to make the move to PEP2, not sure you will want to tackle this.

I only used the software you are running one time to test out a TSU9400. I've not owned a TSU9400 in over 11 years.

Wish I could be of more help but this is all I've got.