Without much diagram it is quite hard to diagnose the problem, but did you do digital split between console? Do you use 2 dante HY card on PM? Try Enable Sync to External on the HY card which are the preferred leaders though I'm not sure it will help.
How many hops between switch? Try to set higher latency and see if the issue persist? I saw 1 RIO having 0.25ms latency while others have 1ms, try to set it all to 1ms or higher.
Talking about switches, that CISCO SG95-24-AS is actually not compatible with Dante due to it being EEE switch (https://www.audinate.com/learning/faqs/can-i-use-eee-energy-efficient-ethernet-or-green-ethernet-in-my-dante-network), but afaik if no other devices connected except Dante it might still be able to work (or not as switches are generally not standardized for real time application)
Any unmanaged non-EEE switch should work though
What Cisco Business Switch did you use? Have you tried disabling EEE on the managed switch? I did one using Cisco 350 series (as 300 series is End-Of-Life) and so far doesn't seems to have issue but it was used between Yamaha TF, Allen Heath D-Live and SQ boards.
These are all good suggestions, but I'm going to sum up a bit and list my top 3 Dante Troubleshooting steps for intermittent problems.
1. Disconnect the secondary network on ALL devices.
2. Set Latency for all devices to maximum amount allowed.
3. Hunt down and eliminate ANY and ALL possible EEE switch settings.
In my experience, with new configurations/installs EEE switches or switch settings are the Far Most Likely culprit for intermittent audio dropouts. So be SUPER sure that you've hunted down any possible culprits before you move on to any other troubleshooting steps. It's worth noting that nearly ALL stupid switches sold today have EEE turned ON and it is rarely noted anywhere on the documentation. And I've seen two Linksys switches that looked identical from the outside and one had EEE locked on and the other did not. So this can require some THOROUGH hunting to make sure you eliminate this as a problem.
If these steps clear up your issues, then it's time to start lowering your Latency settings back to nominal levels and reconnecting your Secondary Network. Congratulations, you're back in business.
If this does NOT clear up your issues, Then, what you want to look at is the Latency log between devices that you can see on the device status window in Dante Controller. Offset between devices should remain fairly constant. If it's varying considerably even after all the steps I list above you need to start digging deeper into switch settings and other issues.
Finally, in my experience Dante issues are ALMOST never caused by "bugs" or other equipment failures. Note emphasis on ALMOST. It can happen, but there are a LOT of other places you should look before you start convincing yourself that there is a firmware bug somewhere that is causing your issue.
Good Luck!
