Do you have more than one ATA or soft phone registered to the same account?
If yes, I suggest you use one device only registerd to the account.
If this set up was working, changing the set up may only make things worse, as the problem may be totally external to the device.
Is there any max download limits on the particular internet connection, and have they been exceeded?
Although it may sound silly and basic, the simplest thing to do may be to just reset the device and perhaps the router and modem, renew all the IPs and wait for things to clear up.
I have four setups that I am managing remotely, in various parts of the globe, and I must say that Voxalot has been working quite stably in the last little while.
Just a thought .............
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