Guidance please. Started to get issues re undercarriage soreness whilst riding. Not changed bike,riding position, type or distance of rides . Tried different shorts and that makes no difference. So thought it must be time for a new saddle. But saddle shows no sign of any wear or damage and still is quite supple to touch. Saddle about 3 years old now , selle italia Q-bik so only a budget level one. Do about 100 miles a week sometimes more. Worth upgrading on saddle and hoping thats the issue?