XBee lose connection when only 1m appart on line of sight

Hello. I have a couple os XBee S2 with PCB antenna. I think there might be some problem with them, because they loose their connection if I put them 1 m appart… As you will understand, this is verry disapointing and I guess one of them or both are deffective. Anyone is facing similar issues? Anything could correct it? Thanks.

Put them further apart don’t be shy. Fact of the matter is to close is like to far you could reconfigure it to have a lower transmission power if the distance has to be 1m but if you still have problems interference is possible but unlikely that leaves magnetic fields like speakers or monitors(old school models) or configuration error.