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LMH6643电容三点式振荡电路

Other Parts Discussed in Thread: LMH6643

请教一下:

 我司用LMH6643MA搭建了一个电容三点式振荡电路,C用的陶瓷贴片电容,L用的线圈(用来探测金属);

 问题是:1. 有部分机器不起振或不稳定,但把LMH6643吹热一点就会起振

                2. 有部分机器在实验室振的很好,但在室外振荡就不稳定,频率会跳;

请问这是因为什么?可怎样改善?十分感谢!

附图: