I have an XBee Pro Series2 module which I set to sleep mode 1 (pin sleep). When I look at the sleep status pin (pin 13), I can see that the module is waking up every 5ms-20ms for approximately 2ms. This happens while the module should be asleep (see screenshot - apologies for the appalling quality).
Does anyone know what would cause such behavior? I’ve tried disconnecting the serial link to the module in case it was some serial event making the module wake up, but it made no difference.