son accounts of sidechain nodes getting depleted when the primary wallet has insufficient funds

Yesterday, the primary wallet account balance went below the fee(20 TEST tokens) and the nodes were continuously running this state.

By the time I got hold of the funds and put the network back in a stable state, I could see that the son accounts of the sidechain nodes(sonaccount01,sonaccount02...) the funds were depleted(in single digits). Each of them had 40+ test tokens with them.

The issue I believe is because sidechain nodes continuously generating proposals thereby losing funds to fees. It may not be a real-world scenario but good to have a protection mechanism.