Do you mean the 5G wifi will disappear when you download/upload? Or it just disconnect and need to connect again? How far is the device from the router? And how many devices are connected to the...

Never hear about the compatibility issue between them. But CPL depends on the power line in your house, maybe the MR200 interferes the powerline, did you try different wall sockets?

Will it restart randomly if you do not connect the modem to it? If yes, could be the hardware issue on the router. BTW, it is not the latest firmware, can go to this link and download the latest one:...

Put the SIM card into your phone, can you get internet? If yes, check if the device has enabled Data Roaming. Check the band and network type for the SIM card in Spain and see if it is compatible...

What is the model number of the tplink device? Cannot open the link, not sure what's happening

First make sure the SIM card works fine when you plug it into your phone. Here are two instructions about troubleshooting you can do on it: http://uk.tp-link.com/faq-794.html...