sound gets lost on old XPS-13

I have an old Dell XPS-13 that is set up to dual boot Windows 10 and Slackware15. Though it is normally used in Slackware and working fine, when it boots up Windows, sound initially works fine, but on the second boot no sound devices are found. At that point, if I re-boot into Slackware there is no sound, but on the second boot it returns. It seems that something in hardware is getting re-set but I'm not sure where to start better analyzing the situation. All firmware on the machine is up to date as are the two operating systems.Thank you for any suggestions that can be offered.