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problem with P key

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bendo:
i developed a project with MFD-CP8-NT with MDF-B80 display screen , everything works fine, after few days some of  P keys and other keys on B80 no more working, as change the CPU it works again but only for few days, then the problem comes back again, if i use keys using the programming device (PC) they are working fine, i am so confused , please help

Spellbreaker:
Hey there. What do you mean with no more working? Do they work again when you reset the Software / Reset the device or retransfer the software to the CPU? Or is the CPU physically damaged somehow?

bendo:
Hi , i mean that some of  P KEY are no more giving commands i programmed them for , but the rest of the application works normally, when reload the CPU with small application it, still same problem exists , when i changed the CPU it works for few days then same problem comes back again
 

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