[module l86) Problem with hot start mode to get Time To First Fix (TTFF)

I performed a hot start command on the modules. According to datasheet, this mode can get TTFF about 10s. But in fact, it take a long time to get TTFF ( about 2 minutes). About Hardware, I design follow the HARDWARE DESIGN DATASHEET. Can you tell me:

  1. Why ?
  2. How can I solve that problem ?

Thanks for spending time !

Hi NghiHH,
Please test TTFF in an open sky environment. Make sure that the sky is not covered. If you test it indoors, modules can hardly get satellites signal which would cause long TTFF and bad accuracy.
Besides, upgrading the latest firmware may help. For upgrading procedure, please refer to EVB_User_Guide.pdf .

Best regards.
L86NR03A01S.zip (1.2 MB)
QGPSFlashTool_Customized_V1.3.zip (5.2 MB)
Quectel_L80&L80-R&L86&LC86L_EVB_User_Guide_V2.1.pdf (1.2 MB)
Quectel_L80&L86&LC86L_Reference_Design_V1.3.pdf (209.8 KB)