Hi,
Usually I have no problems with the modem but the last couple of days have been a nightmare.
This time I managed to catch it it the act.
Modem is a Technicolor TG587n v3 as supplied by Telstra, I live in Australia.
It gets used around six hours per day, afternoon to nighttime.
There is no dust and it is clean and runs at just below 'just warm to the touch'.