Do you live near power lines or an electrical substation or anything? They can interfer with and actually wreak baby monitors. We have gone through 4 different baby monitors and reciever since moving into this house and it is because of the interference of the power lines and the electrical substation in the surburb across from us.
Yeah, maybe they are slowly 'wearing out'. But both sets at the same time? There has nothing changed in your DD's rooms or the house in general? Weird.
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