Maintenance for the week of April 6:
• [COMPLETE] ESO Store and Account System for maintenance – April 9, 9:00AM EDT (13:00 UTC) - 6:00PM EDT (22:00 UTC)
I also noticed that. Especially on Sunday evening after the trader change happened (PC EU). It starts to have a considerable delay after around 10 minutes the third week in a row already. Changing notes and ranks on the guild roster is also slowed when that happens.