Used to have this problem when running ME. Never did cure it. I always blamed Norton, and they do admit that "some systems" can be affected by their software in this way.
Only stopped when I changed my hard drive and bought XP.
Huawei P10 review
1995-2015: How technology has changed the world in 20 years
An overview: What leading creative agencies are doing to improve diversity
New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.