Have you been able to determine if this is occuring from within your environment or if it is a strong external interference? For example, do you see the same interference when outside of your building?
If it’s internal, then you should be able to perform “radio-orienteering” to find the source using the directional antenna from Chanalyzer. If it’s external then similar process could apply but the likelihood of being able to fix it is much slimmer.