That weak spot is underextusion. The hotend is unable to create proper pressure after travelling and so for the first little bit it comes out weak until it finally builds up pressure for the rest of the layer. Here is more information on the problem How to fix under extrusion after travel.
Since it started recently, it is is either caused by a clog, or by a bowden gap, which is something that happens to all creality printers after some number of hours of printing. Here is more about that: How to fix under-extrusion caused by bowden gap. Check the link but the short version is that you need to clean, possibly trim and reseat the bottom of the bowden tube so that there is a tight seal between it and the hot end.