Los Angeles Major issue:

Widespread underlying fiber-optic cable failures affecting Cogent and Zayo have led to reduced network stability in the Los Angeles area.
Due to nested leasing arrangements within US Tier-1 backbones, the impact has extended to GTT and Arelion.
Packet loss has been observed on routes from Los Angeles toward the East (including Europe); the DMIT NOC has temporarily removed some of the most severely affected routes.

https://tranzact.zayo.com/#!/networkStatus

https://ecogent.cogentco.com/network-status