BYOD Call Reception Latency

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Over the last couple of months, I have increasing been running into an issue where a call will come into my BYOD device, but, when I answer the call, the connection times out. Alongside this issue, I have noticed that when a call comes in, my ATA, with the same number, rings anywhere between 5 and 15 seconds before my BYOD rings (in the past, they both rang almost simultaneously). Anyone else experiencing this issue? Thanks.