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Not definitely but wouldn't know how to diagnose. I'll try and find the model number (probably written under ten years of grime inside the storage bit at the bottom) and consult google. Takes upwards of 30 minutes to turn the oven to a stage where the heating element light appears on the outside (when a month ago it was 'flick a switch = on'). Then when it does appear, it flickers on and off taking an age to get hot - sometimes just turning off and not back on as I've found to the tune of several raw meals.
Definitely knackered? Replacement elements for ovens are a thing and not that hard to fit.