VistaCNC P4-SE pendant stopped working

Just updating to this topic, as it has maybe some similarities with my problem.
I had pendant working for a minute and then it crashed. Only Linuxcnc txt on display.
Problem was very unrepeatable, sometimes it did not work at all, sometimes 15min.
I tried it with usb repeater, usb hub, selfmade repeater with -5V input, usb hub with 5v, moving pc far away from control, different usb ports, Bios, updated the linux, ferrites, checking shielding etc etc. very frustrating.
My pendant is p4-Se, with shortest cables.
Last thing I wanted to test was to bypass E-box, that was last becouse proprietary ethernet cable that pendant has, ethernet-usb adapters dont work.
So I chanced whole ethernet cable to USB cable app 2m long. After that there has been NO errors, works like a dream, and liking how the pendant works.
Maybe at some point I will get back figuring hard E-stop, but I think not in a year.

Did you have a arc suppressor across the relay contacts? When switching an inductive load
(like the contactor coil) with a switch or relay, you will generate huge amounts of EMI without
arc suppression (via a snubber for AC coil contactors)

There is no Ethernet involved with the P4-SE. The RJ45 connector on the pendent is used so that it can bring out the USB interface and the E-Stop contacts. The E-Stop contacts are picked off and connected to the screw terminals on the E-box and the USB is passed through to the USB Type B socket. So the E-box screw terminals are just another switch to be placed in the E-Stop chain. That is why the Ethernet-USB adapter didn't work.

Glad you got it working. I really like mine. I'm using the coiled cord. I wish it was wireless but then the E-Stop on the pendent wouldn't be as trust worthy.

At somepoint my pendant would not be regocniced even when the controller box was not powered. So im thinking it wasnt EMI
Maybe the cabels were bad or I have some problems with motherboard. Next i would have bought USB card for a pci slot to test.

My words for Ethernet might have been wrong, should have just used ”Ethernet”

For my machine this 2m cable is totally fine, luckily.

Got it. You meant RJ45 connector and not Ethernet protocol. My problems stemmed from static electricity. In fact yesterday while working on testing a remap of M6 tool change macro I noticed the pendent display "LINUXCNC" for just a split second but it didn't seem to affect the operation. It is winter here now so the air is very dry and I am wearing a sweatshirt. When I get up from my chair and then touch something grounded that is either metal or plastic I get a shock. If I am holding the pendant it at that point it probably would have lost connection. No that I have a touch screen mounted next to the machine I don't sit down as much.