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It has been a while since I've used my Ultimate 3S for WSPR and it has worked flawlessly in the past. However now, no signal seems to be transmitting and the oscillator calibration with GPS keeps increasing the frequency constantly. It is now up to 27,011,491 and climbing. This can't be right. Any ideas of what the problem may be??

Based on 27MHz I’m assuming you are using a crystal reference synthesiser rather than the TCXO

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its possible the crystal or 5351 is failing but try setting the frequency back to nominal and see if it transmits on frequency OK and cleanly ?

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Also try another GPS antenna if you have one and see if the GPS attribute ?display looks good?

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Beyond that the cheapest fix that also an upgrade is a new synthesiser board with TCXO option as an easy-build ?plug in swap ?(just needs the freq changed to 25MHz in the Ref freq menu?

Thank you, thank you, thank you. I do have the TCXO option and the reference frequency was at the default of 27 MHz. I had accidentally done a factory reset and forgot it needed to be changed? to 25. All good now.