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If it's been bled properly and lever action is restored to firmness, then it shouldn't need bleeding again so soon or often as yours.
There could be a leak somewhere? At any of the joins in the line, or an imperfect seat on the bleed nipple, or tired seals in the master or calliper.
It could also be down to very old fluid in need of a complete change, or inferior, or incorrect fluid.
On my 900 I had problems with the pads not retracting as they should although the brake was very effective. I tried all the usual things but finally cured it by fitting a new master.
The Brembo rear brake masters aren't great and do fail unfortunately.
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