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Just come across this post. From a technical point of view the headphones and the mobile the cleaner planner app are on will have been EMC tested ( Electromagnetic compatibility) In short any electrical device has to be tested to ensure it will not interfere with another device nearby, All Spring products are tested and conform to EMC standards. So it is very unlikely that the headphones are creating the issue.

However as other have commented this might be down to missunderstanding  or error when using cleaner planner. Perhaps run a training session on Cleaner planner, use paper lists in the short term. As other have suggested check time stamps on the app are all the jobs singed off in a short period.

Do a little digging and investigate, but from a technical perspective it is highly unlikely the headphones are creating interference with a phone app.

Cheers