There are different critical steps about the gel (especially the points 3.2 to 3.8 of the on-line protocol) that can influence how it will stick during all the experiment. The first important thing is the temperature of the slide and of the buffers. Everything must be cold. The room temperature must also not be too high. The time (5 to 10 minutes) for which the slide stay on ice-pack and the temperature of the ice-pack is also important (take it out of the freezer 10-20 minutes before the use for the experiment). It is also important to slide off very gently the coverslip after the agarose has solidified.
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