Sounds like it could be the alarm that was struggling to receive rather than both keys struggling to transmit. I wonder where the receiver is on the sigma alarm, could be the connection has been degrading due to a high resistance connector or something. I'm afraid I wouldn't know where to look in my classic let alone on the bug but I would assume it's up under the dashboard somewhere. Have you had any problems with water leaks, all the rain recently could have been enough to finish it off if it's been running round a cable loom and into a connector.
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