I had this problem on my wired connection with Windows. Exactly 24 hours after boot, I would lose my connection with certain services (mostly realtime games! very annoying!) After some investigation, I realized that my computer renewed its DHCP lease with the route at this time, and switched to a static IP allocation. Problem solved.

Honestly, this should not cause anything to lose its connection (the renewed IP address is the same), but it did, so I worked around it.