Boost Network System Slow

[wireless]

Ok so let me explain a little bit.
I have been having on and off problems with the network since I got it installed. at the moment if you connect to the main boost router then you get around 120-130MB/s download and upload BUT when you go downstairs that makes you connect to the second one and then your speed drops to about 1-5MB/s I have tried everything I know how to do so I'm coming here for help. To clarify, the second boost router is also upstairs but when I'm downstairs I am right above it how far away is not the problem. Thanks in advance!


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