Can too many frequencies or just wifi signals cause problems in a closed space? Why or why not?

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Reason why this came to me. I recently was using a digital audio board in a room with 300 people/cellphones, police/fire/emt with radios and multiple wifi networks. My ipad refused to connect to the audio board. So this got me thinking if it was possible to have too much wireless clutter in the air. Added bonus if anyone can explain how to avoid this problem but understanding if and how it happens is most important. Thanks!

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