L76 - SBAS time to fix

Hi. I usually wait a few minutes for fix quality in rmc sentences to indicate SBAS as the source for dgps correction. Is this normal? can it be faster? I must have the maximum repeatability of the position accuracy. The effect is that when I save the position indicating by the module, after a few minutes DGPS will change the correction from SBAS, when returning to the position it shows me 2-3 meters in another place.

Dear Sir
Does updating the firmware still have this problem?