Why a lot of force close?

Recently, the remote force closing is my main closing reason. It happens some a lot of times, so I spent a lot of money. I don’t know why it happened. At first, the reason for closing was almost cooperative closing. But someday , remote force closing got larger. I think my node is working well.

Because of many fees, I am thinking about closing my node.

Please, tell me some reason why the remote force closes happens a lot. And how to fix the problem. Thanks for your reply.

P/S. I just use Thunder and RTL app. My coding skill is not high. Please, explain easily.