Sampling buffer

After the protein sample has been spiked with Sampling Buffer, boiled at 95°C for 10 min, and centrifuged at 14,000, individual samples will be delaminated prior to sampling, what is the reason for this?

When electrophoresis is performed on a sample denatured with buffer, if the sample does not move when the sample volume is high, and if the sample volume is low, the sample runs fast and unevenly, how to solve the problem?

Sediment has been found in this product, can I continue to use it? What should be done?

Does the sample buffer have an effect on the effectiveness of the electrophoresis solution? If the buffer is accidentally run out does it need to replace the electrophoresis solution?

Is it feasible to boil and denature proteins before adding protein upload buffer?