B1300 device connect support

What is the maximum number of device connections supported by b1300,
Currently, I have network instability after connecting 70 devices.

By our test:
Maximum 52 devices can be connected to 2.4GHz WiFi, but more than 17 devices may be instability.
Maximum 75 devices can be connected to 5GHz WiFi, but multiple devices too close to each other can cause network instability.

Are there any restrictions on wired connections?

It has only two 1Gb LAN ports, so the total bandwidth is fixed.