Ecosys FS-3540MFP Stop printing or delay printing

Hello, I am in trouble with Ecosys FS-3540MFP!
The case is related with that the printer can't print in real time, the device start to printing ten minutes later with delay, I see the printing task in device in printer settings in computer and they are wait and wait and wait and nothing, delay after delay.

I don't have errors and indications for problems in device.

I can fix the problem every time with one restart of the computer and few days the printer works fine but the problem coming back again and I have to reboot computer again to fix the problem.. and it is not general solution of my case.

Do you have ideas what's wrong with Ecosys FS-3540MFP device?
What can I do and where is a problem?
Now I will try to fin technical documentation of device and I will start to read it.

The first thing what is coming in my mind is the RAM memory of device maybe is low but I am not sure maybe one upgrade to more RAM will solve the problem but I want to hear your opinion.

I will be happy to see your answers and your experience.

Thanks and regards!