try checking the properties on the connection. look under the options tab. there is a field that says idle time before disconnect, i would set this to never if using BB since there are no call charges.
what firewall are you running ?
iPhone X review
How to find a font: Discover the name of a typeface with these apps
The best iPhone for 2017
Les meilleurs logiciels de montage vidéo gratuits (en 2017)