Due to a considerable reduction of the lake level in the early 19th century, serious and unexpected structural damages to the church vaults and roofs were detected. Three important renovation campaigns took place - the first in the 1830s to repair the structural damages including the removal of the "paradisium's" upper storey (it had an upper storey at that time for accommodation facilities), the second in the 1880s including repairs after a serious fire in the southern round tower in 1885, and the third in the 1930s. Many former changes to the buildings carried out in Gothic (e.g. steep tower roofs) and Baroque style (e.g. wider windows) have been re-altered to Romanesque style.