Summoned Permutation Peddler busy?

Never seen this before: the Vet AA summoned the Permutation Pedder, but he refuses to trade.

[Sun Feb 17 02:05:59 2013] Summoned Permutation Peddler says 'Can't you see I'm doing something here?'
[Sun Feb 17 02:06:02 2013] Summoned Permutation Peddler says 'I am not open for business right now.'
[Sun Feb 17 02:09:20 2013] Summoned Permutation Peddler says 'Catch me some other time, I am working on something else now.'
[Sun Feb 17 02:09:49 2013] Summoned Permutation Peddler says 'I don't have time for that now.'

And he was saying that the whole time until he despawned. WTH?

Ha! He did this with me yesterday- not when I first summoned him, but after I'd moved away from him in the zone, and he followed me (stalker), he got stuck in the NPC moving messages loop.

It happened to me when I summoned the peddler while I still had a regular merchant open

Been happening forever. Not sure what causes it though.

It's a bargaining ploy. Try telling him you will pay more per item

And I was thinking Norrathian government shutdown.