The 6500 is becoming intermittent

Been solid up to today. I was monitoring the 17 meter JT portion of the band.
Worked a few stations, and was just listening.
Suddenly the 6.5 dropped out, but came back to life after 10-15 seconds.
I started checking the usual suspects.
Solid 12volts, wiggling the cable had no effect.

Checked the link from the computer.
Wiggling that cable did not cause or stop it.

Rig fans are blowing, slight feeling of air movement to side vents.but not real strong.
(I didn't light a candle to check for airflow.) LOL but could feel it on my hand.
The Blowers in the Flex are very quiet, and no dust buildup on the vents.
Not warm in the shack and rig is in the clear. Don't have a thermometer  to place next to the rig.
Rig sure doesn't feel warm. Rig is not warm to the touch.

I love this rig...please, anyone have any questions or ideas?

Just for info. JT is a mode that sends a constant  but modulated signal for about 50 seconds, then goes into receive so the other person can send for a minute.
I've been doing a lot of JT65 and JT9 and a bit of cw.
All barefoot to resonant antennas. No other evidence of rfi in the shack.