Oh that makes more sense why your Frame Utilization changed, @DigitalMan2020! Makes sense now. (We need to remember to post on other thread too.)
Yeah this change can happen starting in release 22.0. See the Release notes section “LTE and 5G-NR colocation additions and improvements” on page 10. https://support.cambiumnetworks.com/files/pmp450/
LTE colocation feature
LTE colocation feature now automatically adjusts the allowed range of Downlink Data percentage on the APs Configuration → Radio page to ensure no overlap with LTE occurs. In previous releases, PMP 450 APs automatically adjusted the PMP frame start to ensure it aligned with that of LTE. But the selection of a proper downlink data percentage to prevent PMP downlink transmission from overlapping with the LTE uplink transmission from a nearby LTE sector was left up to the operator to use the Cambium tools to calculate and adjust it. In System Release 22.0, this computation is done in software. Also, for any existing PMP sectors already running LTE colocation, when upgrading to System Release 22.0 if the current configuration introduces overlap with LTE, the Downlink Data percentage in the Configuration → Radio page, is automatically adjusted for the operator to the nearest proper value. To use the above mentioned improvements, an operator additionally needs to specify the LTE subframe configuration in use as well as whether a normal or extended cyclic prefix is used as shown in Figure 7. Prior to System Release 22.0, only the LTE Frame configuration could be selected.
APs that were already configured for co-location prior to System Release 22.0 upgrade see their cyclic prefix defaulted to Normal and the S Frame Configuration defaulted to 7. This should be checked and changed as needed. Note that there is also a slight possibility that the downlink data percentage might be auto-adjusted based on this SSF value of 7 to an undesired value. This should also be checked and adjusted as needed. These corrections can be done directly on the AP. If a large number of sectors need to be adjusted, a small configuration template can be pushed from cnMaestro. A zip file containing 4 sample templates can be found on the Cambium Networks support site:
https://support.cambiumnetworks.com/files/pmp450
This zip file contains, in addition to a template that corrects just the special subframe after the upgrade, a template to enable co-location and set the special subframe configuration after the upgrade, a template to enable co-location prior to the upgrade, and a template to disable/backout co-location.