Stuart P wrote:only taps on the machine are mystuff and channel organiser and these were both installed over a year ago.
Plus all the support TAPs for MyStuff, presumably
so what is the likely cause of this
... and can anything be done to prevent this in future?
Delete all unnecessary channels (pay, porn, shopping, etc.). This is especially important on a 5810, which has less memory available than 5800s. The more channels you have, the more memory MyStuff will use storing EPG data for them all (and the harder both it and EPG2MEI will have to work searching through it and collecting it in the first place). The more memory you use, the more likely the firmware is to screw up with the memory handling, and the more chance you get of memory corruption.
Aim for a total of no more than 40 TV + Radio, which is usually easy to achieve when you weed out all the dross. If you can talk your mum through running CO, she can do it without a PC connected.
Also, make sure she switches it off (i.e. puts it in standby) when not in use. The latest version of MyStuff (6.4) has options to shut down automatically at night (at a time of your choice) if not in use.
Finally, if it's getting on a bit, it might be time for a bit of pre-emptive TLC for the power supply capacitors from andyfras or MikeyP. Again, this tends to be needed sooner on a 5810 than on a 5800 which runs cooler. It's not unheard of for the power supply on a 5810 to start playing up after 2 years.