Rax200 firmware update V1.0.2.8_1.0.45 causes the router to go offline every few hours

This is the first app I pull up whenever I have suspected issues with connectivity:

https://www.pingplotter.com/download 

At first it may look rather cryptic but actually it tells you a lot and really narrows down where the problem is in terms of IP addresses-when an image of the PingPlotter is saved and provided to the ISP it provides both parties a clear picture of what is going on with your connection. Packet loss of course occurs whenever there are disconnects-this app pinpoints where the packet loss occurs first-that is where you need to focus your attention-do no be surprised if it is not your router. Give it a try and post your results here-a picture is worth a thousand words and there are a lot of people far more knowledgable than myself that can contribute a wealth of information. Hope this helps.