68 isn't that many in the grand scheme of things... if it was several hundred or 1000+ or something, then it might cause the throttling... but 68 shouldn't really trigger that.
There is no such thing on another PC on this wallet
And even stranger that it works perfectly on a different PC... there must be something in the setup of that specific PC that is causing the connections to go crazy like that... some AntiVirus/AntiMalware or firewall perhaps?