Anyone having trouble with Tidal cutting out?

Based on the info you provided above, the problem may not be with your ISP.

How is your streamer connected to the Internet?  Are you going direct to the router or using an Ethernet switch?   What device are you using to stream Tidal?

I had similar "cutting out problems" and we determined that my router was not able to handle the streaming load.  It seems that some packets in the router were getting dropped under high demand usage.  We replaced my Linksys router with an Apple AirPort Extreme Router and my connectivity problem was solved.    

My Aurender N10 Music Server is connected to a Luxul 8-port gigabit Ethernet switch and I can stream Tidal with no problems.  I suggest you check the equipment between your streamer and modem to confirm everything can handle the Tidal streaming demands.  The problem could with with the streamer device so please let me know what you are using (but I doubt this is the problem)?

You may need to replace some of this equipment.  

Some additional items to check are:

1)  Update your device firmware:  Check to see if there are any firmware updates available for your device (router, computer, etc.).   Device manufacturers regularly release firmware updates you can download to your device over an active Internet connection.  Most devices also feature manual steps for firmware updates in the "Settings" menu.  The user manual for your device generally includes information about accessing and managing firmware settings, as well.

2)  Are there a lot of other devices connected to the same Internet network you are using that could impact the streaming speed?

3) Many streaming issues are caused by problems with your Internet connection and the hardware used (router, Ethernet switch).   

4) Restarting your device, Internet modem, Ethernet switch (turn off for 2 minutes and plug back in) and router can resolve many intermittent connectivity issues.

Please keep us posted.  

Dude - speedtest is fine and 30 mips will not get you tidal.  You need 50.  and thats pushing it with internet traffic.  

https://www.nicholasoverstreet.com/2010/03/new-wave-communications-the-worst-isp-in-america/

Check the link out - New wave is the worse ISP in america and their speed test is a scam.