Interesting issues with old projector

[Blarg]

Hello, i recently received a Proxima DP8000 from a friend who had bought a brand new bulb several months ago but could not get it to function. So i gave it a spin, it revved up and worked just fine, so i attempted to try it outside a hour or so later and no image displayed. I tried using the light signals and the manual to try and gauge what had gone wrong. According to the manual the projector could not find a display. Confused i left it for about an hour and came back to it displaying in all its glory SO i turned it off let it cool down hoping it would work again but nothing. I brought it inside let it sit for the night and tried again in the morning. Boom it worked. Tried letting it cool down and moving it to another location and nothing. I would think its user error but the thing is the projector is completely cool whilst trying to find a display. I could really use some help here. Thanks in advance