Anytime HUD layout is opened the Minimap switches to pixelated low res and remains until you logout and login.

ISP:
Comcast

Type of Internet Connection
Cable, X1 platform

Internet Connection Speed:
25Mbit/s

Date & Time:
Since patch 3.2

Frequency:
Always

World:
Hyperion

Character Name:
Mason Storm

Retainer Name:
None

NPC Name:
None

Monster Name:
None

Class/Level:
N/A

Party or Solo:
N/A

Race:
N/A

In-Game Time
Always

Area and Coordinates:
All

Housing
All

Steps
Appears related to UI scaling option implemented in 3.2. Only happens at 150% Full HD setting. Not tested on 200% 4K