Does not work with 4 speakers

I bought it to use with 4 Geneva Airplay speakers (Aérosphere) after having seen information on it on the Geneva tech documentation.
It used to work very well with 2 speakers (several days), but with 4,(after another in app purchase of 2 euros) it’s unusable. The connexion is having troubles all the time, it’s even not playing well… I have an Ipone 6, so it should be ok in terms of performance.
For this very high price, it’s not worth. You have to add in app for everything. 2 euros more to play internet radios…etc… 2 euros per added speaker… So in total it’ds about 20 euros, to have something that is just not working. I’ll ask a full refund.

pampelune about WHAALE Multiroom Player, v1.8.6