Vu+ Ultimo 4K Problema iptv

Hi everyone apologize for my english, then I put openpli 6.0 to last 4k
and with iptv when changing the channel the decoder stops and continues to rotate the wheel, the only solution is to turn off the decoder from the posterior button this problem only does with vu last 4k. instead on vu + duo2 and vu + nzero everything ok.menter with the last 4k it is impossible to use iptv, can you solve it? Thank you