Well hard to suggest. I had problems in the past with the dongle, it seems more stable on nRF51 DK (dongle gets really hot but it might be unrelated and just my feeling about stability). I would change PC and nRF5x board if possible, maybe that will help. And indeed Nordic sniffer is just "cheap" variant, useful for hobbyists but if you develop some serious commercial product with BLE you could consider some specialized analyzer/sniffer in hundreds/thousands USD range.
Well hard to suggest. I had problems in the past with the dongle, it seems more stable on nRF51 DK (dongle gets really hot but it might be unrelated and just my feeling about stability). I would change PC and nRF5x board if possible, maybe that will help. And indeed Nordic sniffer is just "cheap" variant, useful for hobbyists but if you develop some serious commercial product with BLE you could consider some specialized analyzer/sniffer in hundreds/thousands USD range.
