Instability with ePMP 1000 and 2000 APs running 4.43 and SMs running 3.5.6?

Products ePMP
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We are trying to upgrade our ePMP APs to 4.4.3 with the plan that we will start deploying F-300 SMs in the field, rather than F-200s. I had made sure all SMs were running 3.5.6, and I upgraded a few APs to 4.4.3 - most SMs connected just fine, and were stable, but a lot of SMs would connect for a few minutes and drop, over and over again. Rebooting didn't solve it, nor did full a power-cycle on the SMs, so I reverted the APs to 3.5.6, and all is stable again.

Since I haven't seen any issues running 4.4.x SMs on a 3.56 AP, I'm hoping I can try a "SMs first, then AP" cnMaestro update to 4.4.3, and I won't see the problem that way, but I admit, I am wary. Is this a known issue? Is there a workaround, or is updating all SMs, then the AP, the best way to do it?

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We had problems with 4.4.3. Had to revert to 4.4.1.

Currently testing 4.5 that was released yesterday.

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We have always had the best results when the AP and SMs are running the exact same version. That's not just Cambium advice -- all makes and models of gear generally work better with the same firmware all round.

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