GNSS 2D Fix Not happening in MangOH red wp7608

I am using an UART sensor in RPI connector (UART1 in app mode configured). when ever this app runs I am not getting gnss 2d fix even after 5 min in out doors.

but if i do not have this app (removed) and reboot and try for gnss fix I get with in no time.

Can some one help me, please what am I missing.

I need both gnss and UART1 running at same time.  

system Info
I am using mangOH Red wp7608 board with latest code legato version 18.07.
root@swi-mdm9x28:~# cm info
Device:                        WP7608
IMEI:                          352913090102979
IMEISV:                        4
FSN:                           XG814285110410
Firmware Version:              SWI9X07Y_02.14.04.00 000000 jenkins 2018/02/14 20:19:41
Bootloader Version:            SWI9X07Y_02.14.04.00 000000 jenkins 2018/02/14 20:19:41
MCU Version:                   002.007
PRI Part Number (PN):          9907762
PRI Revision:                  001.002 
Carrier PRI Name:              GENERIC
Carrier PRI Revision:          002.025_000
SKU:                           1103788
Last Reset Cause:              Power Down
Resets Count:                  Expected: 166	Unexpected: 72


@epsragh this issue is still current?