How are the panels held in place? Is it UPVC capping that runs top to bottom and sits on the edges of adjacent sheets?
The perspex sheet should be supported either side by the aluminium spars. On each spar is a rubber gasket which does tend to stick to the sheet and hold it in position.
At the bottom of the perspex sheet should be a a piece of plastic which is a closure moulding behind which will be some breather tape to allow the honeycomb of the perspex to breath. At the bottom end of the aluminium spar should be a plastic finishing piece which should also stop the sheet from slipping downwards.
If you have the UPVC capping it may have 'splayed' in the heat of the sun thereby not pressing down and trapping the perspex sheet properly.
If that is the case I would remove the perspex sheet completely. Clean the sheet on the edges and the rubber gasket with some white spirit. Allow to dry and replace. I would then get the UPVC capping and warm it with a hot air gun. Start at one end, heat it and squeeze it inwards. Hold in this position until it cools. Work along its length. At the same time warm the part that clicks into the aluminium spar and splay using a decorating spatula.
Now replace the UPVC; you will need a mallet to knock it back into the aluminium spar.
What should happen know is that as you have returned the capping to its original shape it will press down much firmer on the perspex sheet holding it in place. The warm weather should 'stick' the sheet to the gasket.
I have a rubber mallet on the end of a piece of wood to assist in reaching the top of the capping.
If your plastic is brown you will find it distorts more readily than white due to heat retention.
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conservatory roof problem 
conservatory roof problem 