Time: N/A
Frequency: anytime, anywhere
World name: Shiva
Character name: Waliel Hla
NPC name: N/A
Monster name: N/A
Class/Level: all combat classes/jobs
Party or solo: both
In-game time: N/A
Area and coordinates: N/A
Steps:

When using any skill on any class -- including instant skills -- it gets interrupted randomly for no reason, sometimes twice in a row. It can happen anytime, anywhere, and it doesn't matter what class or job I'm playing, if I'm solo or in a party, or in an instanced dungeon. The only thing I haven't tested is crafter or gatherer skills.

Use DoM spell X? Interrupted mid-cast. Use DoW skill Y? Interrupted mid-animation and nothing goes through. It's very annoying, and ends up costing me up to a second of DPS or healing time per interrupted skill, sometimes even more when I don't notice it immediately.

Connection Specs
- Type of internet connection/provider: Cable 100/5M, Elisa
- Modem maker/model number: Bewan iBox 5200n eMTA

PC Specs
-=-=-=-=- System Information -=-=-=-=-
Operating System: Windows 7 Professional 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.130801-1533)
Language: Finnish (Regional Setting: Finnish)
System Manufacturer: ASUS
System Model: All Series
BIOS: BIOS Date: 08/15/13 17:46:50 Ver: 06.04
Processor: Intel(R) Core(TM) i5-4570 CPU @ 3.20GHz (4 CPUs), ~3.2GHz
Memory: 8192MB RAM
Available OS Memory: 8130MB RAM
Page File: 2135MB used, 5992MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 64bit Unicode