This can be caused by many factors but the main ones are:
1. Low LQI.
2. You have reached your device limit.
The maximum number of devices can be up to 200 but it depends on the network configuration.
Some of our customers have a network entirely of routers and in such a configuration the maximum is only up to 80 devices
If you still can't find an answer to what you're looking for, or you have a specific question, open a new ticket and we'd be happy to help!
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