Assistance Please

Type of Issue/Feedback: 90002 error
Name of your Internet Service Provider (ISP): BRIGHTHOUSE/SPECTRUM
State/Country: ORLANDO/FLORIDA
Date/Time: anytime
World Name: Excalibur
Frequency:4-5 times in 3 hours
Same issue since January 2017. Every time I zone out of a dungeon, instance or world, I get disconnected from server ERROR 90002. I checked with my ISP and they said the issue is with your servers. Please help.