So i bought my x920bt off amazon and had it professionally installed last week. I didn't notice right away b/c i didnt use the navigation at first but my unit doesnt always connect to the satellites. Sometimes when i check the connection there are NO bars next to gps and 0 red and yellow satellites connected. Other times it does connect and function properly with bars and everything. There is no rhyme or reason either. My antenna is on the top of my car, there is no obstruction and it hasnt had anything to do with the weather. It has worked during rain and not during a clear day. When i