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Short of hardware failure, likely all in set up.
- Remove derailleur and check hanger alignment with Park alignment tool or equivalent.
- Realign front derailleur
- Try a different chain. Evaluate chain length. Too long, not enough cage tension to prevent chain slipping under load.
- Check for pre load in rear hub and Cassette is tight
- Check preload in crank/BB

Sadly, many bike shops are gravely lacking for proper groupset adjustment to prevent the above.
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