Access point switching channels even-though i'm configured it to to static

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Hi Community,
I recently changed the access point configuration to work on static channels but it still switches between channels every 15-20 minutes. Can anyone help me to clarify what's the issue? I am a beginner in these kinds of things. 
Thank you in advance

[Avicii]

Hi @Ayush_Tripathi ,
It is still switching to a different channel even after I modified the configuration. This issue is consistent across all access points, and it tends to switch channels for a brief period.

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Hi @Ayush_Tripathi 
I checked in Wireshark to see how often it's happening and for how long. I found out that the access point is advertising on these other channels for only one frame; in the next frame, it returns to the normal static channel. Any ideas?