When my XBee is attached to a USB Explorer breakout board and connected to usb power (doesn't need to be PC) everything transmits fine. However, if I do not use the USB Explorer breakout, but any other power supply, the XBee will only transmit when IR is <= 5000ms. Sleep mode is off. I have a Power Supply, and can confirm proper voltage and amperage are being supplied. Why would the XBee function properly only when IR is <= 5000ms? At 6000ms it works sometimes, at 7000ms it works seldom, and above that it doesn't work at all. I have tested with a number of different XBees and power supplies and all have the same issue. I would prefer not to sample and transmit every 5 seconds because it is way too frequently.
I am out of ideas. Any thoughts?