Latency incredibly unstable recently?

Usually, my wifi would be rather poor 4/7 days of the week, but now I have not been able to do anything for the past 2-3 weeks. Nothing has changed since then and I am even connected through Ethernet.

This is my ping test towards google.com

Packets: Sent = 475, Received = 468, Lost = 7 (1% loss),
Approximate round trip times in milli-seconds:
Minimum = 38ms, Maximum = 3594ms, Average = 620ms