Hi,
Couple of the additional information will be helpful to understand the physical environment where you are facing the mentioned issue, like
- What is the approximate device between the AP and the end devices?
- Whether any physical obstructions are there between the AP and the Wi-Fi clients?
- In case multiple Access Points are deployed then what is the distance between those Access Points?
- Whether the Access Point is wall mounted / ceiling mounted / kept on top of a table.
- How many Wi-Fi clients are associated to a single WAP371 device?
Multiple factors (like channel interference, signal coverage issue, physical obstruction) can cause the intermittent Wi-Fi connectivity issue, whether any log is reflecting on the WAP371 device against the problematic device wireless client MAC addresses for the wireless de-association?
Regarding the advance radio settings on the WAP371 device, you may refer the link https://www.cisco.com/c/en/us/support/docs/smb/wireless/cisco-small-business-300-series-wireless-access-points/smb5069-configuring-advanced-radio-settings-on-the-wap371.html
As you are using Apple devices only, so you may also refer the latest recommended Wi-Fi settings guide for Wi-Fi routers and Access Point published by Apple as well https://support.apple.com/en-gb/HT202068
