A few weeks ago, I updated several AP networks including MR86, MR56, and MR models to firmware version MR 31.1.7.1. After the update, the APs began experiencing issues with radio transmit power on both the 2.4 GHz and 5 GHz bands. The transmit power dropped significantly from 23 dBm to 7 dBm, leading to serious coverage and connectivity problems for Wi-Fi devices. We opened a case with Meraki Support, and they informed us that this appears to be a known bug affecting the MR31X firmware versions. Currently, there is no workaround available, and we were advised to downgrade to version MR30.6 as a temporary solution.
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