Which end feels loose, the dc socket on the tablet or the mains (240volts) end (three pin plug?).
If the mains end, you need you need to get a new charger, it is dangerous to continue using it.
If it is the dc socket end, there is not a lot you can do about it, as it is solder to the mainboard, unless you can unsolder it and insert a new one. Have you thought about gluing the dc side into place, so it cannot move?
Answers & Comments
Which end feels loose, the dc socket on the tablet or the mains (240volts) end (three pin plug?).
If the mains end, you need you need to get a new charger, it is dangerous to continue using it.
If it is the dc socket end, there is not a lot you can do about it, as it is solder to the mainboard, unless you can unsolder it and insert a new one.
Have you thought about gluing the dc side into place, so it cannot move?