Although you seem to have identified W-Fi as the culprit you need to find out if your current OBiWiFi and router are working properly of if one of them is faulty. Can you temporarily bring them much closer together and check if the issue goes away? If it does we must assume the equipment is working as designed and proceed as follows.
There are two main problems with Wi-Fi:
1. Low received signal strength caused by distance and/or objects in the path.
2. Interference from other Wi-Fi networks operating on the same or nearby frequency.
5 GHz Wi-Fi usually suffers less than 2.4 GHz from the second of those (because there are more channels available). But as regards the first problem, 5GHz usually performs less well than 2.4 Ghz. So, running an OBiWiFi at 5 GHz is not necessarily the solution for you. (And if your current Wi-Fi router does not have 5GHz, you would need to obtain one that does.)
My recommendations would be:
1. First, try changing your current Wi-Fi router to use a different channel. If you have a smart phone try a Wi-Fi analyser app - I know there are free ones for Android - to see what channel is the quietest at your location. You can also use it to get an indication of received signal strength. It could be that moving your router or the OBi+ObiWiFi a few feet gives a significant increase. Even if not practical or convenient to reposition the OBi200, you can use a USB extension cable to have the OBiWiFi some feet away.
2. If the problem turns out to be low signal strength which you cannot otherwise overcome, I'd suggest an inexpensive Wi-Fi range extender such as the TP-Link TL-WA850RE, TL-WA855RE, TL-WA860RE or similar as available from many manufacturers. Ideally place one of those midway between the router and OBiWiFi.