Images disappearing from my application using Xamarin Forms

I made an application using the Xamarin Forms Cross Platform, at first I only need the android version of it so I do not care about IOS and Windows. The application is working properly when I test it on one of my Xiaomi Redmi 4x cell phones, but when I test it on a Xperia Z1 or another cell with less processing power the images are disappearing. They appear and disappear as I go to other pages. In total the application has 143 images and there is no way I can change it. The application basically consists of texts and images. Use ContentPages and CarouselPages. Example of one of the parts where I use image:

<ContentPage>
    <ScrollView>
        <StackLayout>
            <Image Source="Imagem1Geral.jpg" Aspect="AspectFill"/>
            <Label  Text="Posição Inicial&#x0a;"
                HorizontalTextAlignment="Center"
                FontSize="30"
                TextColor="Black"/>
        </StackLayout>
    </ScrollView>
</ContentPage>

I do not know what to do to stop the images from disappearing ...