RE: Limbs weakening?
I've always dreamed of rescuing a Lady in distress...
Fear not Me-lady, more than likely what you are noticing is caused by string and or cable stretch. Very common with some string materials/construction processes used in less expensive bows. If you can check the axel to axel length and brace height then check that against the specs, you should be able to tell.
If unable or unequipped to do it yourself, a quick trip to your local proshop should put you back in good order.