90K connection issues when playing FFXIV

[Nimlothien]

ISP:
Telenet Belgium

Type of Internet Connection:
Cable

Internet Connection Speed:
200Mbps down 12 Mbps Up

Date & Time:
since 2.55

Frequency:
At least once an hour

Character Name:
Nimlys Selara

World:
Odin

Party or Solo:
Mostly in Duties so 4 to 24 players. Does also happen solo

In-Game Time:
any and all

Steps:
While in any duty, be it a dungeon, trial or CT:
Resource Manager never showed any packet loss, but at least once per duty I'll just 90002. Sometimes it'll even happen 3-4 times in a row. FC chat also still works for about 10s after the boss/other players freeze

While idling/afk in Lavender beds/Limsa Lominsa/ Mor Dhona/etc:
These are rather rare compared to the duty ones

Always a 90002 followed by a 3102

C:\Windows\System32>tracert 199.91.189.74

Tracing route to 199.91.189.74 over a maximum of 30 hops

  1     *       <1 ms    <1 ms  192.168.1.1
  2     1 ms     1 ms    <1 ms  192.168.0.1
  3     8 ms     9 ms     9 ms  d54C0A001.access.telenet.be [84.192.160.1]
  4    49 ms    10 ms    10 ms  dD5E0C3A1.access.telenet.be [213.224.195.161]
  5    12 ms    11 ms    12 ms  dD5E0FA4E.access.telenet.be [213.224.250.78]
  6     *       13 ms    12 ms  ae52.bar1.Brussels1.Level3.net [212.3.238.129]
  7   168 ms   225 ms   242 ms  ae-11-11.car2.Montreal2.Level3.net [4.69.141.1]

  8   127 ms   228 ms   275 ms  ae-11-11.car2.Montreal2.Level3.net [4.69.141.1]

 9    93 ms    93 ms    92 ms  ORMUCO-COMM.car2.Montreal2.Level3.net [4.59.178.74]

 10   100 ms   100 ms   100 ms  192.34.76.10

 11   101 ms   100 ms   100 ms  199.91.189.242

 12    98 ms   101 ms    98 ms  199.91.189.74

Trace complete.

Ping statistics for 199.91.189.74:
    Packets: Sent = 200, Received = 197, Lost = 3 (1% loss),
Approximate round trip times in milli-seconds:
    Minimum = 97ms, Maximum = 119ms, Average = 100ms