Fine if you're talking about the modern age but frequent popular revolts in medieval Ottoman Empire? Gonna need sources on that.
I wrote a few articles about the early Ottoman some years ago, so at the moment I'm hazy about the details and don't have all the books I had back then, but I'll tell you some examples.
The interregnum period 1402–1413 certainly created instability, which in addition to the on going struggle of succession caused several more or less popular revolts ro raise. History focuses on the main characters, who often channeled the dissatisfaction of people against their enemies to gain popular support (much like Skanderbeg did a few decades later). Sheikh Bedreddin led I guess the most popular one 1416 against the most powerful claimant, Mehmed I. He started in Wallachia, but were joined by other revolts in the area ruled by Mehmed. Interregnum is a fascinating topic, if you read about it (and also the sidenotes) you will notice how pretty much all of these rebellios princes met also smaller local revolts in their areas. Some of the revolts were raised to support another claimant than the one governing them, and some of them were born from general restlessness and insecurity of the interregnum era. Because of it, there were many occasions the future of the empire was very unsure.
As you know the Janissaries revolted quite often. The late medieval Janissaries are often romantically described as a super loyal and professional army of the sultan, but in reality the first Janissary revolt took place already 1449, when they successfully demanded better wages.
In the Ottoman heartland, Anatolia, there were revolts, because the local rulers had long roots in the Turkic nobility, and they wished recognization and sometimes even independence, also because differences in ethnicity and religion. A rebellion led by Şahkulu in 1511 was one example where the Turkmen and the Shia muslims revolted against the Ottomans.
The Ottomans faced revolts in recently conquered parts of Europe too. Albanian revolt 1432-1436 was led by Gjergj Arianiti, a friend of Skanderbeg's, also led several other revolts against the Ottomans. Of course a while later, Skanderbeg, a former Ottoman governor, led an over 20 year long revolt against the empire. Sometimes the revolts would give a somewhat founded claim to the Ottomans. They helped to put down the revolt in Morea, asked by the ruling Palaiologos family despotates, and later, as they did have to do the same too often, finally the Ottomans took over completely in 1460. Generally, in the area we know as Greece it was quite restless for the Ottomans all the time, from the very beginning.
Depends of exactly when we see the medieval period ending namely in the Ottoman empire. For example the Ottoman empire and their rival Hungary are both described as medieval during the time of the battle of Mohacs (1526). The Ottomans conquered Damascus in 1516 and there already were a several revolts in few years time, like al-Gahazi's, who named himself as sultan and revolted to form another Mamluk empire.
This topic fascinates me to no end, but as I currently have to work on another area so I have to be cautious to not get myself too deep in this lol.