IR function goes away after re-imaged disk

[Videoguy]

Help! Sony IR blasters inop
Greetings! I have a Sony SVR-2000 with the latest 1.62 Oztivo image on it. I used to about once every three months or so have problems with IR codes working through the IR blasters to control a Foxtel Pace digital series STB.
Now even after I re-image the hard disk about 6 hours after it comes out of maintenance mode the IR blasters start to only give two digits instead of three. Then in a little while they stop all together. In the past a hard reboot usually fixed this now NOTHING WORKS! I need to know should I replace the IR blasters? Or just replace the Tivo as it is now about 4.5 years old. Its just strange how something can work fine and then about 2 hours later it doesn't work at all or improperly. Any ideas from the experts? I'm tired of troubleshooting this rig and about a hair away from turfing it.
Edit/Delete Message

[Darren King]

It *could* be a hardware fault but I've never seen anything like this. Anything is possible however. Shame you think that turfing the TiVo is your only option as they are very repairable.

[Videoguy]

Yeah I was just getting a bit miffed at playing with this thing so much to get it to work properly. Anyhow with the change of weather here in Sydney I have a theory. I think heat is a factor with my IR problem which would explain that the Tivo works fine for the first few hours after being unplugged for awhile and then eventually as it heats up ( and it was running around 40 yesterday ) it begins to fail. I"m going to try some extra fans I will add to see if it helps. I never had this problem before because we lived in Melbourne and never had a problem with things getting too hot in the house we lived in.
What do you think Mr. King?

[Darren King]

I run TiVo's in test mode in a rack at around 55C to see if any faults appear. A healthy TiVo will not fail at this sustained temperature and if it does there is a hardware problem (obviously :) )

Your idea of testing further sounds good. My advice would be to run the TiVo with no cover on and a fan blowing into it. If your problem goes away then yes it is a mainboard hardware issue and will require further attention. The fact that you mention it will work fine for a few hours from cold does indicate something amiss somewhere. Attempting the above in an effort to keep it cooler will test and narrow it down to either a software (and therefore no change in fault behaviour) or hardware issues if the fault does not appear.

[Videoguy]

For some reason the old Oztivo image always worked best on this Tivo.
Do you know where I can find 1.50 image?
Thanks, I'm still having problems with the IR blasters working, sometimes they work sometimes not. weird maybe it is just slowly failing.

[petestrash]

There is no difference between r1.5 and r1.62 as far as IR is concerned