Keyboard Jogging Problems!!!.

I am currently seeing a very serious problem with keyboard jogging on a fresh install of the current version of Linuxcnc 2.9, installed using the current ISO.  Occasionally when jogging using the keyboard it appears as if the jog key you press sticks and the machine will continue to jog long after you release the key.  Sometimes it won't stop jogging until you press a different keyboard key (what key doesn't matter.)  I have only observed this behavior when using keyboard jogging.  Jogging using the mouse to click on screen jog buttons behaves normally.  This is a very serious and unsafe problem.  I just updated the control on this machine from Linuxcnc 2.7 to the current version, and I had never observed this kind of behavior before.  I've already totally smashed one limit switch jogging before homed, so no soft limits.)

The machine is using the Axis UI, running on an industrial (fanless) i5 mini computer.  Latency seems OK and the UI is very responsive not laggy at all.  

Is this some kind of bug?  Could it be a Debian setting? 

Is it a wireless keyboard? I've had those start that when the battery died.

I suspect its a hardware fault. Its a long time since I've used 2.9 on a live machine but it never happened to me.
Can you swap out the keyboard for another one? Some compressed air to blow out the keys perhaps?

To answer a few questions,

Tommy,
The soft limits work fine after the machine is homed. The crash into the hard limit happened before homing the machine while jogging from a long distance to get close to the home switch before homing.

This is a new pc bought just a few months ago for this refit.

NWE and Rod
It is an ordinary USB wired keyboard, and exhibits no signs of physical sticking keys, (other than this issue while jogging).

I'll try the xset -r, and report back. But the problem is intermittent, and may not act up for testing.

This also occurs with Qtplasmac. I can replicate it if I use the keyboard to jog and click to another tab while jogging. It loses focus/control even if I release the keyboard jog arrow and I have to go back to the main tab and tap a jog button again to get it to stop jogging.

I'm running the standard Axis UI, with a Glade VCP side panel and a tab. (But I'm sure I was not using or touching the mouse at the time that the key sticking occurred, because I press the jog keys with the same hand that I use the mouse with.)

PS.  This really has the feel of a bug to me.  The older versions of LinuxCNC I had been using (2.7) running on RTAI kernel versions of Debian and Ubuntu, had never exhibited this kind of dangerous behavior.  I've seen some other people posting similar issues, did these problems start with the switch to GTK3 or might it be closer connected to the switch to Preempt RT or a later Debian version?