Recently, I got Skype Desktop version 8 update. I update to Skype v8 about 1 week. Although MS did not mention the issue is fixed by this release, but the issue is gone from my laptop.
Last week, I tried to update skype to v7.38.x.xxx but seems still encounter this problem.
I have 3 laptops. Two had join the office network domain, one is in Windows 10 RS1 Enterprise edition and another is in Windows 10 RS2 Pro edition. These 2 systems encountered this issue when update to skype 7.37 or after. The other laptops in Windows 10 RS2 or RS1 Home edition, no matter which skype version in the system, did not encounter this issue never.
When I upgrade Skype for Windows desktop 22.214.171.124, the CPU usage is occupied by skype and the CPU usage is around 30% always.
the previous version is 126.96.36.199 and the CPU usage usually, almost always stay in 0%.