Since this frictional force will be lower than the static value, the load accelerates until the decompressing spring can no longer generate enough force to overcome dynamic friction, and the load stops moving. The pushing force due to the spring builds up again, and the cycle repeats.
The load increases its speed until the decompressing spring's force is insufficient to counteract dynamic friction, causing it to stop. Then, the spring's push accumulates again, leading to a continuous cycle of acceleration and deceleration.