Intermittent Transaction Error Notification after Signature Key!!!
We recently updated our site to support Signature Key. Afterwards, we get Intermittent transaction Error Notifications saying Your script timed out while we were trying to post transaction results to it. About 1/10 transactions fail.
We have other websites on the same server running different Authorize.net scripts and never get that error. One does up to 100,000 a month in sales and never once gets the time out message so it's not server related. That site also does not use a Signature Key like the one having a problem.
Whatever the problem is is definately related to using the Signature key. Prior to switching that over, we have never once had that error.