First step is to verify the coding is still set to DRL on via NCS Expert.

If it is, I would probably next replace the bulbs just to be sure - they may be failing intermittently, perhaps the flash to pass "brightness" is less bright than it was before, and the DRL brightness is so dim that it is not illuminating.

If DRL's are coded on and bulbs are verified to be good - then it is possibly an LCM issue. The LCM controls the DRL's - it just sends a lower voltage to them for DRL operation.