Help on Longines Ultronic, suddenly stopped

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hello to all and Merry Christmas
I have 2 Longines Ultronic that I bought NOS, they were working and suddenly stopped , anyone knows a good watchmaker in Europe ( I’m in Spain , Barcelona) that can fixe them, my watchmaker doesn’t work with this type of watches unfortunately.
Sharing pics of the beauties and thanks in advance for your help
 
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That was my first guess when the OP said they both stopped
 
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A watchmaker who doesn’t work on these? Might he at least check them out to see if the batteries have cratered? Not a very helpful watchmaker from the sound of it!
 
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Sure batteries are full and new. My watchmaker is pretty good but he doesn’t like electronic watches , he can do the mechanical part but not the electric
Hope I get the right watchmaker somewhere
Thanks
 
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If you're happy sending overseas then I highly recommend Paul electricwatches.co.uk.
 
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The diver’s model might be easy to solve. The crown is in a SETTING position! Press it into the RUN position, and see what happens. Listen to both watches very carefully. Some people have great difficulty hearing these watches humming. Might either or both watches hum?
 
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The diver’s model might be easy to solve. The crown is in a SETTING position! Press it into the RUN position, and see what happens. Listen to both watches very carefully. Some people have great difficulty hearing these watches humming. Might either or both watches hum?
I listen HUM on both watches , I only pulled out the crow not to damage the watches as it’s humming but not working , so I guess will help not to force the caliber
 
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If they both still hum but the time doesn't advance, then it is time for service. Been there on many in the past.
 
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If they both still hum but the time doesn't advance, then it is time for service. Been there on many in the past.
Both were NOS, so no service history at all