What are the reasons why the eth network increase its gas frequently?

[LogiC]

I've noticed that eth network are often increases gas price frequently. Before the gas has only 2 gwei at its normal price but seems that it has increase to 8 to 12 as it normal now. From what I understand, miners are reduced since eth price is not suitable for mining now. But if this continue, the gwei can increases tremendously as miners quit to build rigs due to consumption are great than profit of doing it.