Pole display connected by serial port freezing after a while

[AndhikaR]

i have cart page when scanning item it write to display pole price amount of the item, it works normally, then after finishing cart it move to payment page, on payment page
and on idle, pole display showing running message, i show it using setInterval, and clearing interval when cashier scanning item

for a while, it works normally, but after an hour or more the pole get freeze, my running message not running and scanning item not assigned to pole, what do i need to do?