Hello to all

I have a Kenmore elite large capacity gas dryer model # 110.70942990, SER: MK2413999
The problem I am having is I only get low heat when its on the cotton setting, in the last week it has been taking about 2 hours to dry a normal load that use to takes about 45 minutes, in the past I had a similar problem except I had no heat at all so I replaced a heat sensor and it fixed the problem, dose anybody have a fix for this problem?
Thank you

Normally low heat and slow drying is due to slow venting. The drier will start overheating and turn off the heat early. Make sure the venting is clear. You can test this by unhooking the venting and drying a load and see if it dryes normally.