Target not in range

Time: 2:08 PM EST
Frequency: Sometimes
World name: Malboro
Character name: Jayken Lacontice
Race: Miqo'te, M
NPC name: none
Monster name: Fire Sprite
Class/Level: ACN/22
Party or solo: Party 4
Area and coordinates: Halatali X6 Y11

Sometimes I am unable to attack while right next to my target and it gives me the "Target out of range" alert. See attached screenshot.http://i.imgur.com/b00m4nx.png

Connection Specs
- Type of internet connection/provider: Comcast Blast 105 Mbps
- Modem maker/model number: Motorola, Surfboard model SB6141

Laptop Model Name: Lenovo IdeaPad Y510p
Laptop Model Number: 00179-60894-99400-AAOEM