PMS Stops Internet Connection & Doesn't Properly Scan Library Properly

Greetings! I am currently running the latest version of the Plex client on Win7 64bit, with the latest PMS update on Comcast Xfinity Blast with a Netgear C3700 router/modem. Have previously had no issues with Plex and have been a very happy user for years now.

Recently got a new external HD, and decided to just do an entire library refresh, since a lot of my files had found new homes. Never had any issues with scans in the past, but now, when I attempt to scan my new libraries, Plex pretty much takes down my entire internet connection, whether it be the wired Ethernet on my PC, or wifi on my devices. And on the Plex end of things, not much happens as far as getting things scanned into the library during all of this, the process pretty much just shoots down the internet and then moves it a glacial pace. Some things WILL make it on, but not nearly enough or at the appropriate speed.

I have tried multiple things including reinstalls, using a VPN, router resets, etc. Even gone so far as to just setup test library scans with only one or two items in them to see if it was not perhaps just because I was scanning too large a library. Still the same issue, internet becomes unusable.

I browsed the forums here and saw similar issues, but most were with FIOS and none of their solutions fixed my issue, so any and all help would be appreciated, thank you much!

EDIT: Reset the router to factory again and it seemed to have fixed the issue, will monitor and report back.

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UPDATE: The router reset fixed things briefly, but now things are happening the same way again, though I was able to scan most of my collection before encountering this issue again. Now, I will clarify, this does happen when I try to scan what is nearly 3tb of music - but I have done this in the past without any issue. It’s natural to expect a little slowdown and for things to take a while with that much content, but again, as stated, this pretty much kills the network and any remote access.

This is really bumming me out because man I love Plex and I especially loved using it to stream my music :\

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