Networking issues???

I am not sure if this is the correct place for a networking issue so MODS if i am wrong I am sorry.

This has been a brain teaser for me for a while now and I hope someone here can give me some insight.

CONFIG:
R7000 Nighthawk router
N700 Modem (comcast internet)
Synology NAS
3x Chromebox running OPENELEC
-2x on wifi
-1x wired
various other network items.. ie PS4 laptop PC …

ISSUES:
1. Comcast internet sucks.. i am experiencing about 70% up-time with random periodicity and longevity. I don’t really expect any idea’s on this one. Its more of a battle between Comcast and I.

2. This issue has only shown itself since issue 1 (since I moved here) When the internet is down.. (request timed out on a ping to google.com) the rest of my LAN connections are significantly slower. Somewhere in the 25Kb/s range. Too slow for any content except music but even that is sluggish. This problem is present on all of my devices wireless and wired connections. Issue 1 mostly occurs after 2pm and before 10pm. right when i want to watch tv.

3. When rebooting Openelec sometimes it halts boot process. It stops sometimes with a mouse pointer in the top left after a KODI splash screen. Sometimes it is just a black screen before the KODI splash screen. This started after updating to Openelec 8.0.0. I don’t have any logs for this issue as i am mainly concerned with Issues 1 and 2 to start with.

Thank you for reading my long winded questions.
Justin