Name of Internet Service Provider (ISP)
Orange

Country of residence
Poland


When does the problem occur (e.g. only during specific times such as in the evenings?)
constant, worse during peak time

Frequency of problem (e.g. every 2 minutes)
Every 5sec : freeze / lag during peak time. More like every 15sec otherwise.

Game content in which the issues occur (e.g. dungeons, trials, certain areas)
Everywhere


It seems that wtfast helps, without it the game is unplayable.