Whats wrong with my conbee 2 stick ? disconnect all devices (on pi3+)

1

my conbee drops connection to my zibgee (aqara etc,) i have changed wifi channel to 1 and 6
conbee runs on channel 15. i use an extension cable (tried 3 different) but it do this
(range 5 mtr – free line)
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but all disconnect

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