[Elecraft] K2 trouble on 160M

[NZ0T]

Now that I have my K3 at home I moved my K2/100/KAT100 to our lake cabin. 
Last weekend it started to shut down on 160 only when transmitting over
about 70 watts.  All other bands are fine, the antenna (160M dipole fed with
ladder line thru 4-1 balun and about 6' of coax into the cabin) is fine and
the ground  seems fine.  It was shutting down the MFJ 4125 switching power
supply so thinking maybe RF was getting into the supply I took the rig home
and it worked just fine there.  Brought it back this weekend with an Astron
linear supply and while that PS is not shutting down the rig still wants to. 
I have used this same setup before here with no problems and this started
happening suddenly last weekend.  I tried the rig without the KAT100 thru a
manual tuner and it still wants to shut down.  My Icom 706 works fine on 160
with the same configuration.
Ideas?

73,

Bill NZ0T
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