GPS on 1198 and 1159

Have a directional GPS puck hooked to my 1159. \The 1198 and the 1159 are networked thru an Ethernet box I set my setting on the 1198 to use the the 1159 directional GPS puck and within 2 or 3 minutes a box appears saying GPS signal lost I go back to settings and the unit has switched from the 1159 setting to the 1198 internal setting Anybody got ant help or answers why this is happing I've checked all the connections and everything that is obvious to me Thanks for everyones help and time