Just a heads up. I had updated our MS350-48's to the 12.28 firmware this last weekend and started having intermittent issues on Tuesday and then today my network basically went down. Network was hit and miss, tried pinging multiple websites and had a 50% drop rate. Getting onto Meraki site sometimes would connect. Ended up connecting to Meraki with LTE device and rolled back the firmware and that fixed the issues. Hopefully you don't have the same problem wit the 355's.
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