I phoned my ISP yesterday after having many months of my computer slowing down as the month went on and then returning to speed at the start of the next month. They said that it was because I switch my modem off several times a day (ie when I go offline) and that it should be kept switched on all the time. They are now sorting out the problem at their end and my modem is on all the time. The plug is warm though, which concerns me. It didn't worry me when I used to switch it off as it cooled down then, but now it has no chance to cool down. It isn't painfully hot, just warm, but am I right to be concerned?