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There may be interferences from electrical appliances fridges, TV. Move the radio to some other place. For AM rotate the radio to get the best signal. For FM and SW deploy the telescopic antenna. For SW you may use an external antenna. For SW, to tune in on a station you need to know the broadcast time and the frequency.
Offhand, can you pls try and do a reset. This model don't have a reset button, but you can try removing the batteries for say an hour or so. The idea is to reset the microprocessor if the problem is software/firmware. Preset/memory would be erased as well as any personalized settings if you do this. But the unit will be back to factory default.
If the reset doesn't work, then your particular version/model has a slight offset resulting to the "humming sound". This is a known problem and many in the "ham" world have written corrective procedures which would require an insulated tuning/alignment screwdriver or at the very least a jewellers screwdriver and doing a bit of alignment by "ear"
If you are adventurous to give this a try, pls post back. Otherwise your best bet would be to seek the services of a qualified ham radio technician.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
When you turn on the radio or select a wave band the display shows the last frequency you tuned in. That gives you 3 frequencies: One for the AM nd, one for the FM band (and maybe 3 for SW. That does not look like much but there is nothing you can do about it. Sorry. It does not have Autamatic Tuning System, nor memory locations to store favorites stations. The portable Grundig/Eton such as the G5, G3, G8 have a plethora of memory locations and ATS.
This problem can be caused by a loose external power connector. This will require disassembly of the case and some soldering. it is possible that the battery terminals are corroded if any batteries have leaked.
If you sent it in 3 times, then I would suggest getting a new one if you know for sure that other's work in that area. If other's don't work, then then you have some type of interception between the radio waves and your radio. There is nothing I can do about that, and probably nothing you can do.