I have an early 2008 MacBook Pro and running Mavericks. It seems to operate well, except for two weird problems. I am in Ireland, so I do not have an Apple store to bring this to. I suppose I could go to London, but I'd like to have an idea what's going on first (if possible!) Wifi Sometimes the Wifi will drop. The icon will show full bars, but when you select it, you won't see a single network listed, even though it is on. If you go to Network Preferences, it will show the wifi as on. If you turn the wifi off, you won't be able to turn it on again, as clicking turn on will do nothing. The only solution I have found is to reboot the machine, which is less than desirable. Lock Ups These are not spinning ball locks up. These are absolute freezes. No keys are responsive. Hitting the capslock key yields no light. Everything just is frozen. If I was playing a game, the music will sort of carry on in a very distorted and looped/stuttering fashion. I've noticed this type of lockup is most likely to occur if I had the laptop on my lap and then, in the process of picking it off my lap to the table, it would lock up then. This is how it locks up 3/4 the time; however, not always. It can be on my lap and just freeze. I've even had it freeze while on the table a couple times, so perhaps the movement of the laptop is just a coincidence, though I really think it may be related. The lockup does not seem to be programme related, per say, as it can happen when I'm playing a game, when I'm in word, when I'm in Chrome, etc. I used to think it had to do with Safari, as one day I was running Safari and it kept locking up over and over, seemingly every 15 minutes or so, so I switched to Chrome and it had ceased for a few hours...but it still locks up, so I doubt that was it. What can I do to diagnose this/fix this? It's driving me a bit nuts. I haven't lost any important information, yet, but I figure that's only a matter of time. I have smcFanControl and the fan is running most the time. My temperature runs about 98 to 150, generally around 120 (like right now). I also have Trim Enabler. I have a few games, Word, Excel, Skype and thats about it. Nothing else is installed and I installed Mavericks about 5 weeks ago, so it's a clean install.