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The RX timeout check sampled GetTickCount64 on the UI thread while the UDP receive thread could update FRXLastPktTime a millisecond later. Both values are QWord, so subtracting the newer packet tick from the older UI tick underflowed to a very large value and falsely satisfied the 3-second timeout. Snapshot the packet timestamp once for each timeout check and require NowTick >= LastPktTick before calculating the elapsed interval. The initial-packet timeout uses the same snapshot. This preserves real timeout detection while ignoring a packet timestamp that is marginally newer than the UI tick. Diagnostics confirmed that DDC UDP packets, callbacks, and HP status remained continuous during the reported failures; the issue was local timeout arithmetic rather than network loss or radio stream interruption.