Main Landing Page Dramatic Fluctuations for past few weeks

[Foureyes]

I have been monitoring some dramatic fluctuations for my main landing page. I am still pretty new to SEO (Two and a half years in).
Basically my main landing page will rank incredibly well for days at a time then drop off the map... and then return at a high ranking for the local keywords I am wanting to rank for. It's been happening for a few weeks now. I am looking into some possible keyword canibalization with my location page but I am a bit perplexed.
I don't think I have experienced this type of constant fluctuation, even in the midst of an update cycle.

Has anyone else had experience with this type of SERP behavior?
Any thoughts on possible things to look at?

 

[Foureyes]

I forgot to mention Local Pack is still ranking top three while these fluctuations are happening.

 

[JoyHawkins]

Sounds like it could be a potential filter issue. Are there any other businesses that offer the same services that are in your building or across the street from you?

 

[Foureyes]

Sounds like it could be a potential filter issue. Are there any other businesses that offer the same services that are in your building or across the street from you?

Hi Joy, Thank you for responding! That is a possibility. There is similar business in the building next to ours. Similar address but with a building letter and suite number. It hasn't been an issue in the past but after looking more closely that company is on the first page now. Things are pretty volatile at the moment so I usually try not to panic, but the SERP behavior wasn't something familiar.

 

[JoyHawkins]

Usually what you will see with filtering is they take the spot (or close to it) that you have when you see yourself ranking.