According to studies on the stability of fixed retainers, the rate at which they come unstuck or break in the first year is between 30% and 50%. This means that during the retention period there is a considerably high chance of a problem with a fixed retainer.
There can be various reasons for it coming unstuck, and some of them are related to errors during bonding, for example:
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The adhesive getting wet during the procedure
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The tooth surface not being properly cleaned before bonding
If the retainer comes unstuck within the first 6 months after it was fitted, there is a high likelihood that the cause was a bonding error.
Other common causes include:
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Eating hard foods (nuts, crunchy foods)
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Careless flossing or use of toothpicks
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Using the front teeth to bite on hard objects – for example tearing sticky tape, chewing pencils or opening packaging
These factors can significantly shorten the life of a fixed retainer, which means it will need to be rebonded or replaced if the problem keeps happening.
This answer is for general information. Your own case needs an examination by an orthodontist.