To keep the wifi up, I run a script which pings the router every five seconds. I'm running raspbian, and I have a personal dislike for NetworkManager, lol, so that is disabled. I've only had my pi a few weeks and have not left it on the whole time, but I intend to eventually and I have left it on for some long stretches. And yes, I applied all remedies preventing OS crashes as no turbo and increased minimal VM memory size. So I am currently out of clues what can issue the behavior. I do not have monitor or keyboard attached, and attempt to attach something issues rebooting of the device. I can't actually confirm that device going to sleep. Trying to poll something from the device doesn't prevent going in sleep mode. The solution as buy another raspberry pi and make it all time pinging sleeping one doesn't work since only being a server getting requests prevent device going to sleep. it means that device still goes in sleep although wi-fi is awake. I found some answers here that a reason of device freezing can be that wi-fi card is going in economy mode, so I followed the instructions and can confirm that the dongle doesn't go in sleep but it starts blinking like getting not attended from computer. The device connected to net using wi-fi dongle. However if the server wasn't requested for certain amount of time (it is hard to tell exact time), the device seems going to sleep (hopefully not crash).
The device provides some web service features and supposes to be active 24/7.
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