Another kind of bug. The thermal bug
During the evolution of ExtIO_sddc code the Co-Authors and I made many tests on different computers to verify operation. One of the PC candidate was the laptop (Asus UX330U | 2017 | i7-7500U cpu) that I used during early development of BBRF013 / ExtIO_sddc.dll. Starting January 2021 I noticed something very strange. The application HDSDR was on but the audio stream was discontinuous and sometimes crashed. I thought about some software bugs. After some testing with different code versions and on other PCs I installed Open Hardware Monitor on this PC and I noticed that the problem was related to CPU temperature. I thought that the CPU cooling was not efficient even though the internal fan was spinning. When the CPU temperature reaches high value the CPU clock is decreased to dissipate less heat. The behavior modulates speed performance of the CPU. The PC is 4 years old so I fear dust inside, not good thermal ...