Canon printer missing half the lines on page
iMac running Catalina, as cannot support newer OS, with Canon TS 6250, running perfectly including Pages and printing until today. From Pages (11.1 2031 .0.102), now prints 3 lines, then blank, then 3 more lines, etc for whole page. Normally using USB cable but tried wireless with same result. No help on Canon website. Any ideas please
iMac 21.5″, macOS 10.15