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TP Link Deco and Hub 3 internet speeds dropping dramatically

Hi - am hoping some others may have experienced similar issues and can help. 
I purchased a set of Deco S4s (x3) as a mesh network to replace the Hub 3’s WiFi as it just can’t reach whole home and extenders were rubbish. 
Having set it up a few days ago, initially the speeds and coverage were extremely good across the whole house. However after a few hours I noticed problems with video conferencing and when I tested download speeds it would kick up to over 130mbps and visibly drop to nothing (like 0.03mpbs) before my eyes in seconds. This problem persisted until I rebooted both modem and main Deco. This problem has now occurred every day since setting up the Decos and can only seem to be rectified by rebooting everything - which I do not want to have to do every single day! 
has anyone else experienced this and has any idea what is causing it / how to fix it please?? 
I want to keep the Decos if possible but this issue is not sustainable to rectify every day. 
thanks all. 

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Re: TP Link Deco and Hub 3 internet speeds dropping dramatically

I should have said: I have switched the Hub 3 to modem mode and running main Deco unit as router. 

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Re: TP Link Deco and Hub 3 internet speeds dropping dramatically

I had similar issues with Deco P9, Ive swapped it for a tri band router
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