Crosstar keys suddenly BOTH have a very short 'blip' range

[shufty]

...The MK2 keys may not have as much to do as the MK4 ones but I only changed the batteries in both keys once in 11 years.

[Kremmen]

I suppose older central locking keys are dead, except for the brief millisecond they transmit on button press.

[Lord Voltermore]

Increase range - key in hand hold against head and press button - silly but it works - o go on give it a try.

I wonder if it will work by holding it against your belly. That would give me almost unlimited range. 

[nowster]

Unlocking a car with your Brain - Sixty Symbols

[Hicardo]

I can see you've had a lot of fun with this thread...haha 

Back to original topic, just for a second. 

I have not changed the batteries in the keys, but everything now seems to have returned to normal without doing anything.  So I guess it must have been some kind of temporary interference.  Hopefully the problem has gone away