Help, think I cooked my film...

[fireboomer]

Currently in Marocco and I am really enjoying this trip. I have my dads Olympus camera with me. It has a good zoom and does it all (focus,...) automatic. Wich is good for me since I don't know that much about photograhy.
As for film I have 100 ASA slide film with me.

Since some days I notice that the shuttertime (think that's the righ term) is quite a bit longer and the camera almost always indicates I should use the flash. The first films I used, I had shuttertimes up to 1/500 or 1/350 easily. Wich I think is quite good. But then again I don't know that much about photography.
The last 2 films the shuttertime always was 1/100 or below. I thinks this is quite long and I can't figger out why this is happening. At first I thougt the batteries of the camera might have been going flat, so I changed those but it stayed the same. I also switched films but that didn't make a difference.
So the only thing I can think of is that the films migt have gone bad because of high temperature.
In a sleepy moment I have placed my films in the wrong pannier wich means they have spent some time on the side on the bike closest to the exhaust. There where still some clothes and otherthings inbetween, but still...

Can anyone help me out with some advice or explain to me what is happening or has happened?
At the moment I am in Taroudant and I think I might find new slidefilms if needed around here.

Are the films that got to hot lost? Can the guy who will develop then in Belgium do anything? Should I mention something special...?

Lots of questions, just hoping the slides will come out ok.

Thanks for any help.

Pieter.