How do I fix an Iphone 5S which stops getting Wi-Fi signal for about 20-30 seconds?

So this is the case, I have installed a new Fiber router with two bands (2.4 and 5 ghz). I connected my iphone 5S to the 2.4 ghz which works fine however it somehow stops receiving Wi-Fi for about 20-30 seconds from time to time. I know this inst a router problem since other devices are working well with 2.4ghz. Any workaround for this? The5ghz works ok so far.

Turn it on and off flight mode for a minute or so, or take to a repair shop

Sounds like your phone's Wi-Fi radio may be the problem.
not really an easy way to fix that on an iPhone.

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