Google Nexus 5 — MMS & torrents??

Greetings,

My son has a Nexus 5 that I recently rooted for him. He is running the stock 6.0 rom. He is having times when he can not receive MMS messages. It will just sit there downloading. This was a problem before he was rooted. I had him try messenger instead of hangouts & that worked for a while but started again yesterday. After I rebooted, it seemed to work for now. Any thoughts? He also has a similar problem downloading torrents. Sometimes it works & sometimes nothing will work. Would going to a different rom help? Maybe Pure Nexus or CM13. Any thoughts would be appreciated.

Pat Callaghan