Erratic temp, watering, nutrient, pests, genetics or infection are the possibilities. If the watering and temp are known good ⁰pyou can eliminate those. Check the leaves top and under sides to eliminapte pests. Damage or faded parts of a leaf will identify nutrient or infection.
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HLVd has a wide variety of symptoms. The leaves having a vegetable compost smell is common. True test is to look at the trichomes with magnification. Should have a solid stalk with rounded or bulbus tip. If it has dents and wrinkles like it is deflated, that is a sign of all HLVd infected plants.