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LMX2615EVM-CVAL: Can not lock on to a frequency VCO or VCO's unlocked. they show lock in software. It get into a mode I can not find a solution

Part Number: LMX2615EVM-CVAL

For some reason the LMX2615 PLL and/or software gets into a state where I am unable to lock on to a frequency. I get to work again eventually but I am at a loss on why it happens, what is going on and can not come up with what might fix it. I basically have to start the whole thing over again and input all the settings again. Sometimes reset works but other times it does not. loading the default configuration helps but other times it does not.